Writing Clean Code

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Presentation Date : January 2022 | Need help? Contact the team.

1 What is Clean Code?

Clean code is code that is easy to understand and easy to change.

It’s writing code that is:

• Readable

• Understandable

• Maintainable

• Extendable

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2 Why Should we Write Clean Code?

By using clean code and making the code readable you will save time for yourself and others in the future when adding new features, testing, fixing bugs and collaborating.

Code is like humour. When you have to explain it, it’s bad - Cory House

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3 How to Write Clean Code?

Writing clean code is about always considering the principles when writing code.

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3.1 Use Descriptive Names

Use meaningful names for variables, functions, or whatever it is you’re naming.

Avoid abbreviations that you understand now but which will be unclear to others, or future you.

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Exercise

Let’s look at an example, suppose you want to select a variable name for the number of patients, which one would you pick?

# Number of patients - option 1
x = 10

# Number of patients - option 2
no_pat = 10

# Number of patients - option 3
No_Pat = 10

# Number of patients - option 4
Number_Of_Patients = 10

# Number of patients - option 5
number_of_patients = 10

# Number of patients - option 6
number.of.patients = 10

# Number of patients - option 7
numberOfPatients = 10

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Show Answer

The general rule is to have all letters in lower case separated by underscores.

This style of naming is also known as snake case.

# Number of patients - option 5
number_of_patients = 10

There are other conventions you can follow as well, as shown in the image below.

Illustration done by Allison Horst

# Number of patients - option 4
Number_Of_Patients = 10

# Number of patients - option 6
number.of.patients = 10

The most important principle of variable naming is consistency. It is fine to use capitalization or not, or use different formats for different types of variables, as long as it is consistent throughout your code, and clearly communicated to the people that you are working with.

You can find more information on PEP 8 – Style Guide for Python Code or The tidyverse style guide – Style Guide for R

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3.2 Comments

Code comments give extra information that is not executed when the code is run. They can be added by a preceding hash character (# This is a comment).

Comments are essential to help those working on the code in the future to understand any non-obvious details around how and why the code has been written in a particular way.

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Exercise

Let’s look at the comments below, any thoughts on how useful they are?

# Set number_1 to 5
number_1 = 5

# Set number_2 to 9
number_2 = 9

# Set total to the sum of number_1 and number_2
total = number_1 + number_2

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Show Answer

Comments that describe exactly what is occurring in the code, as above, are often not necessary.

They may be redundant, if good naming practices are followed to self-document the steps that occur in your code.

# Set number_1 to 5
number_1 = 5

# Set number_2 to 9
number_2 = 9

# Set total to the sum of number_1 and number_2
total = number_1 + number_2

Avoid “noise” comments that tell you what you already know from just looking at the code.

Comments can be used more effectively to explain why you might have written code in a certain way.

For example, you might explain to other analysts and developers why a section of your code doesn’t follow standard practices, perhaps because the typical method didn’t work.

This type of comment can help to clarify your decision-making process, without needing to describe the individual steps taken.

# Tried solution X, but Y worked better because of Z

# Don't use function X here, because of Y

# Temporary work around for bug in function X
# TODO: fix function X, so that Y

# This section of code is commented out because of X

Comments are sometimes used to divide long sections of code into sub-sections that relate to their overall functionality.

That said, the merit of doing so will depend on the value added.

For example, the code below is already self-documenting and therefore adding the section headings does not add much value.

# Import Libraries
import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt


# Get data
penguins = sns.load_dataset("penguins")

# Analyse
species_means = penguins.groupby("species").mean()

# Report
plt.plot(penguins.bill_length_mm)
species_means.to_csv("penguin_species_mean_measurements.csv")

In summary, you should use comments sparingly but purposefully. Make sure to:

• explain why certain things are done, in order to provide context around the decisions that you have made.

• not use commenting to echo what your code is already telling the reader.

• and as with any other documentation, make sure comments are accurate and still relevant after code changes.

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3.3 Do not repeat yourself (DRY)

Don’t repeat yourself aka DRY promotes that the code we create should be unique, avoiding or reducing duplicated code. Having the same code in multiple places makes maintainability harder, if we make any changes to the code it needs to be updated in different places instead of just one. Duplicated code also adds complexity and makes the code excessively long. A general golden rule is that when we find ourselves creating duplicated code, that’s a good usage for a function.

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3.3.1 Strategies for Writing DRY Code

• Write functions for a task that is performed over and over.

• Create loops that iterate over repetitive tasks.

• Use conditional statements to control if and when code is executed.

Lets look at an example.

Suppose we have the data below, lets say we want to find out how many unique years there are and then split the dataset into individual smaller datasets based on the year. E.g 1952 would only have data for that year.

import pandas as pd

gapminder_dataset = pd.read_csv("gapminder.csv")

gapminder_dataset

country	continent	year	lifeExp	pop	gdpPercap	infant_mortality	fertility
Afghanistan	Asia	1952	28.80100	8425333	779.4453	NA	NA
Afghanistan	Asia	1957	30.33200	9240934	820.8530	NA	NA
Afghanistan	Asia	1962	31.99700	10267083	853.1007	NA	NA
Afghanistan	Asia	1967	34.02000	11537966	836.1971	NA	NA
Afghanistan	Asia	1972	36.08800	13079460	739.9811	NA	NA
Afghanistan	Asia	1977	38.43800	14880372	786.1134	NA	NA
Afghanistan	Asia	1982	39.85400	12881816	978.0114	NA	NA
Afghanistan	Asia	1987	40.82200	13867957	852.3959	NA	NA
Afghanistan	Asia	1992	41.67400	16317921	649.3414	NA	NA
Afghanistan	Asia	1997	41.76300	22227415	635.3414	NA	NA
Afghanistan	Asia	2002	42.12900	25268405	726.7341	NA	NA
Afghanistan	Asia	2007	43.82800	31889923	974.5803	NA	NA
Albania	Europe	1952	55.23000	1282697	1601.0561	NA	NA
Albania	Europe	1957	59.28000	1476505	1942.2842	NA	NA
Albania	Europe	1962	64.82000	1728137	2312.8890	106.50	5.96
Albania	Europe	1967	66.22000	1984060	2760.1969	86.80	5.38
Albania	Europe	1972	67.69000	2263554	3313.4222	71.00	4.81
Albania	Europe	1977	68.93000	2509048	3533.0039	58.60	4.09
Albania	Europe	1982	70.42000	2780097	3630.8807	56.10	3.46
Albania	Europe	1987	72.00000	3075321	3738.9327	40.80	3.13
Albania	Europe	1992	71.58100	3326498	2497.4379	32.50	2.87
Albania	Europe	1997	72.95000	3428038	3193.0546	26.80	2.61
Albania	Europe	2002	75.65100	3508512	4604.2117	21.00	2.20
Albania	Europe	2007	76.42300	3600523	5937.0295	16.70	1.80
Algeria	Africa	1952	43.07700	9279525	2449.0082	NA	NA
Algeria	Africa	1957	45.68500	10270856	3013.9760	NA	NA
Algeria	Africa	1962	48.30300	11000948	2550.8169	148.20	7.65
Algeria	Africa	1967	51.40700	12760499	3246.9918	149.20	7.66
Algeria	Africa	1972	54.51800	14760787	4182.6638	140.60	7.59
Algeria	Africa	1977	58.01400	17152804	4910.4168	119.00	7.24
Algeria	Africa	1982	61.36800	20033753	5745.1602	84.60	6.58
Algeria	Africa	1987	65.79900	23254956	5681.3585	46.30	5.51
Algeria	Africa	1992	67.74400	26298373	5023.2166	38.10	4.24
Algeria	Africa	1997	69.15200	29072015	4797.2951	35.10	2.99
Algeria	Africa	2002	70.99400	31287142	5288.0404	32.40	2.41
Algeria	Africa	2007	72.30100	33333216	6223.3675	26.40	2.66
Angola	Africa	1952	30.01500	4232095	3520.6103	NA	NA
Angola	Africa	1957	31.99900	4561361	3827.9405	NA	NA
Angola	Africa	1962	34.00000	4826015	4269.2767	NA	7.39
Angola	Africa	1967	35.98500	5247469	5522.7764	NA	7.40
Angola	Africa	1972	37.92800	5894858	5473.2880	NA	7.23
Angola	Africa	1977	39.48300	6162675	3008.6474	NA	7.19
Angola	Africa	1982	39.94200	7016384	2756.9537	136.80	7.20
Angola	Africa	1987	39.90600	7874230	2430.2083	134.10	7.20
Angola	Africa	1992	40.64700	8735988	2627.8457	133.50	7.12
Angola	Africa	1997	40.96300	9875024	2277.1409	131.50	6.95
Angola	Africa	2002	41.00300	10866106	2773.2873	125.50	6.78
Angola	Africa	2007	42.73100	12420476	4797.2313	117.10	6.52
Argentina	Americas	1952	62.48500	17876956	5911.3151	NA	NA
Argentina	Americas	1957	64.39900	19610538	6856.8562	NA	NA
Argentina	Americas	1962	65.14200	21283783	7133.1660	59.59	3.09
Argentina	Americas	1967	65.63400	22934225	8052.9530	58.73	3.05
Argentina	Americas	1972	67.06500	24779799	9443.0385	58.00	3.15
Argentina	Americas	1977	68.48100	26983828	10079.0267	47.20	3.39
Argentina	Americas	1982	69.94200	29341374	8997.8974	32.80	3.21
Argentina	Americas	1987	70.77400	31620918	9139.6714	27.10	3.06
Argentina	Americas	1992	71.86800	33958947	9308.4187	22.80	2.92
Argentina	Americas	1997	73.27500	36203463	10967.2820	19.60	2.66
Argentina	Americas	2002	74.34000	38331121	8797.6407	17.10	2.38
Argentina	Americas	2007	75.32000	40301927	12779.3796	14.10	2.25
Australia	Oceania	1952	69.12000	8691212	10039.5956	NA	NA
Australia	Oceania	1957	70.33000	9712569	10949.6496	NA	NA
Australia	Oceania	1962	70.93000	10794968	12217.2269	19.50	3.43
Australia	Oceania	1967	71.10000	11872264	14526.1246	18.30	2.85
Australia	Oceania	1972	71.93000	13177000	16788.6295	16.80	2.74
Australia	Oceania	1977	73.49000	14074100	18334.1975	12.70	2.01
Australia	Oceania	1982	74.74000	15184200	19477.0093	10.10	1.93
Australia	Oceania	1987	76.32000	16257249	21888.8890	8.70	1.85
Australia	Oceania	1992	77.56000	17481977	23424.7668	6.70	1.89
Australia	Oceania	1997	78.83000	18565243	26997.9366	5.40	1.78
Australia	Oceania	2002	80.37000	19546792	30687.7547	5.00	1.76
Australia	Oceania	2007	81.23500	20434176	34435.3674	4.50	1.92
Austria	Europe	1952	66.80000	6927772	6137.0765	NA	NA
Austria	Europe	1957	67.48000	6965860	8842.5980	NA	NA
Austria	Europe	1962	69.54000	7129864	10750.7211	32.90	2.80
Austria	Europe	1967	70.14000	7376998	12834.6024	26.40	2.62
Austria	Europe	1972	70.63000	7544201	16661.6256	24.10	2.09
Austria	Europe	1977	72.17000	7568430	19749.4223	16.60	1.63
Austria	Europe	1982	73.18000	7574613	21597.0836	12.60	1.66
Austria	Europe	1987	74.94000	7578903	23687.8261	9.40	1.43
Austria	Europe	1992	76.04000	7914969	27042.0187	7.10	1.51
Austria	Europe	1997	77.51000	8069876	29095.9207	5.00	1.39
Austria	Europe	2002	78.98000	8148312	32417.6077	4.40	1.39
Austria	Europe	2007	79.82900	8199783	36126.4927	3.80	1.38
Bahrain	Asia	1952	50.93900	120447	9867.0848	NA	NA
Bahrain	Asia	1957	53.83200	138655	11635.7995	NA	NA
Bahrain	Asia	1962	56.92300	171863	12753.2751	114.10	7.17
Bahrain	Asia	1967	59.92300	202182	14804.6727	74.50	7.00
Bahrain	Asia	1972	63.30000	230800	18268.6584	48.10	6.09
Bahrain	Asia	1977	65.59300	297410	19340.1020	32.60	5.28
Bahrain	Asia	1982	69.05200	377967	19211.1473	24.00	4.69
Bahrain	Asia	1987	70.75000	454612	18524.0241	20.10	4.13
Bahrain	Asia	1992	72.60100	529491	19035.5792	18.70	3.47
Bahrain	Asia	1997	73.92500	598561	20292.0168	13.10	2.93
Bahrain	Asia	2002	74.79500	656397	23403.5593	10.20	2.67
Bahrain	Asia	2007	75.63500	708573	29796.0483	8.50	2.29
Bangladesh	Asia	1952	37.48400	46886859	684.2442	NA	NA
Bangladesh	Asia	1957	39.34800	51365468	661.6375	NA	NA
Bangladesh	Asia	1962	41.21600	56839289	686.3416	167.60	6.79
Bangladesh	Asia	1967	43.45300	62821884	721.1861	153.00	6.92
Bangladesh	Asia	1972	45.25200	70759295	630.2336	148.20	6.93
Bangladesh	Asia	1977	46.92300	80428306	659.8772	141.40	6.68
Bangladesh	Asia	1982	50.00900	93074406	676.9819	127.80	6.06
Bangladesh	Asia	1987	52.81900	103764241	751.9794	110.80	5.13
Bangladesh	Asia	1992	56.01800	113704579	837.8102	92.10	4.20
Bangladesh	Asia	1997	59.41200	123315288	972.7700	74.00	3.47
Bangladesh	Asia	2002	62.01300	135656790	1136.3904	58.60	2.91
Bangladesh	Asia	2007	64.06200	150448339	1391.2538	45.90	2.44
Belgium	Europe	1952	68.00000	8730405	8343.1051	NA	NA
Belgium	Europe	1957	69.24000	8989111	9714.9606	NA	NA
Belgium	Europe	1962	70.25000	9218400	10991.2068	27.00	2.63
Belgium	Europe	1967	70.94000	9556500	13149.0412	22.50	2.43
Belgium	Europe	1972	71.44000	9709100	16672.1436	18.70	2.05
Belgium	Europe	1977	72.80000	9821800	19117.9745	14.10	1.73
Belgium	Europe	1982	73.93000	9856303	20979.8459	11.20	1.59
Belgium	Europe	1987	75.35000	9870200	22525.5631	9.20	1.56
Belgium	Europe	1992	76.46000	10045622	25575.5707	7.60	1.60
Belgium	Europe	1997	77.53000	10199787	27561.1966	5.50	1.61
Belgium	Europe	2002	78.32000	10311970	30485.8838	4.40	1.68
Belgium	Europe	2007	79.44100	10392226	33692.6051	3.90	1.80
Benin	Africa	1952	38.22300	1738315	1062.7522	NA	NA
Benin	Africa	1957	40.35800	1925173	959.6011	NA	NA
Benin	Africa	1962	42.61800	2151895	949.4991	180.60	6.39
Benin	Africa	1967	44.88500	2427334	1035.8314	164.00	6.63
Benin	Africa	1972	47.01400	2761407	1085.7969	152.50	6.82
Benin	Africa	1977	49.19000	3168267	1029.1613	136.70	6.98
Benin	Africa	1982	50.90400	3641603	1277.8976	124.70	7.02
Benin	Africa	1987	52.33700	4243788	1225.8560	114.80	6.90
Benin	Africa	1992	53.91900	4981671	1191.2077	103.20	6.60
Benin	Africa	1997	54.77700	6066080	1232.9753	94.20	6.21
Benin	Africa	2002	54.40600	7026113	1372.8779	85.20	5.82
Benin	Africa	2007	56.72800	8078314	1441.2849	75.20	5.37
Bolivia	Americas	1952	40.41400	2883315	2677.3263	NA	NA
Bolivia	Americas	1957	41.89000	3211738	2127.6863	NA	NA
Bolivia	Americas	1962	43.42800	3593918	2180.9725	167.70	6.65
Bolivia	Americas	1967	45.03200	4040665	2586.8861	153.60	6.59
Bolivia	Americas	1972	46.71400	4565872	2980.3313	138.00	6.50
Bolivia	Americas	1977	50.02300	5079716	3548.0978	121.30	5.90
Bolivia	Americas	1982	53.85900	5642224	3156.5105	107.20	5.34
Bolivia	Americas	1987	57.25100	6156369	2753.6915	94.00	5.03
Bolivia	Americas	1992	59.95700	6893451	2961.6997	80.20	4.81
Bolivia	Americas	1997	62.05000	7693188	3326.1432	66.80	4.39
Bolivia	Americas	2002	63.88300	8445134	3413.2627	53.70	3.98
Bolivia	Americas	2007	65.55400	9119152	3822.1371	42.20	3.55
Bosnia and Herzegovina	Europe	1952	53.82000	2791000	973.5332	NA	NA
Bosnia and Herzegovina	Europe	1957	58.45000	3076000	1353.9892	NA	NA
Bosnia and Herzegovina	Europe	1962	61.93000	3349000	1709.6837	NA	3.85
Bosnia and Herzegovina	Europe	1967	64.79000	3585000	2172.3524	NA	3.24
Bosnia and Herzegovina	Europe	1972	67.45000	3819000	2860.1698	NA	2.68
Bosnia and Herzegovina	Europe	1977	69.86000	4086000	3528.4813	NA	2.27
Bosnia and Herzegovina	Europe	1982	70.69000	4172693	4126.6132	27.20	2.02
Bosnia and Herzegovina	Europe	1987	71.14000	4338977	4314.1148	20.40	1.89
Bosnia and Herzegovina	Europe	1992	72.17800	4256013	2546.7814	14.70	1.59
Bosnia and Herzegovina	Europe	1997	73.24400	3607000	4766.3559	10.10	1.50
Bosnia and Herzegovina	Europe	2002	74.09000	4165416	6018.9752	7.20	1.28
Bosnia and Herzegovina	Europe	2007	74.85200	4552198	7446.2988	7.10	1.21
Botswana	Africa	1952	47.62200	442308	851.2411	NA	NA
Botswana	Africa	1957	49.61800	474639	918.2325	NA	NA
Botswana	Africa	1962	51.52000	512764	983.6540	109.00	6.65
Botswana	Africa	1967	53.29800	553541	1214.7093	94.10	6.70
Botswana	Africa	1972	56.02400	619351	2263.6111	79.10	6.58
Botswana	Africa	1977	59.31900	781472	3214.8578	63.20	6.40
Botswana	Africa	1982	61.48400	970347	4551.1421	50.00	6.01
Botswana	Africa	1987	63.62200	1151184	6205.8839	42.00	5.21
Botswana	Africa	1992	62.74500	1342614	7954.1116	44.20	4.39
Botswana	Africa	1997	52.55600	1536536	8647.1423	51.30	3.75
Botswana	Africa	2002	46.63400	1630347	11003.6051	50.30	3.23
Botswana	Africa	2007	50.72800	1639131	12569.8518	45.50	2.91
Brazil	Americas	1952	50.91700	56602560	2108.9444	NA	NA
Brazil	Americas	1957	53.28500	65551171	2487.3660	NA	NA
Brazil	Americas	1962	55.66500	76039390	3336.5858	122.90	6.14
Brazil	Americas	1967	57.63200	88049823	3429.8644	109.80	5.49
Brazil	Americas	1972	59.50400	100840058	4985.7115	97.40	4.78
Brazil	Americas	1977	61.48900	114313951	6660.1187	84.70	4.34
Brazil	Americas	1982	63.33600	128962939	7030.8359	69.70	3.85
Brazil	Americas	1987	65.20500	142938076	7807.0958	56.80	3.17
Brazil	Americas	1992	67.05700	155975974	6950.2830	46.80	2.64
Brazil	Americas	1997	69.38800	168546719	7957.9808	34.80	2.45
Brazil	Americas	2002	71.00600	179914212	8131.2128	24.30	2.26
Brazil	Americas	2007	72.39000	190010647	9065.8008	17.10	1.94
Bulgaria	Europe	1952	59.60000	7274900	2444.2866	NA	NA
Bulgaria	Europe	1957	66.61000	7651254	3008.6707	NA	NA
Bulgaria	Europe	1962	69.51000	8012946	4254.3378	NA	2.21
Bulgaria	Europe	1967	70.42000	8310226	5577.0028	38.40	2.14
Bulgaria	Europe	1972	70.90000	8576200	6597.4944	31.60	2.16
Bulgaria	Europe	1977	70.81000	8797022	7612.2404	28.10	2.18
Bulgaria	Europe	1982	71.08000	8892098	8224.1916	22.50	2.06
Bulgaria	Europe	1987	71.34000	8971958	8239.8548	18.20	1.94
Bulgaria	Europe	1992	71.19000	8658506	6302.6234	19.10	1.60
Bulgaria	Europe	1997	70.32000	8066057	5970.3888	19.40	1.23
Bulgaria	Europe	2002	72.14000	7661799	7696.7777	16.30	1.22
Bulgaria	Europe	2007	73.00500	7322858	10680.7928	12.30	1.40
Burkina Faso	Africa	1952	31.97500	4469979	543.2552	NA	NA
Burkina Faso	Africa	1957	34.90600	4713416	617.1835	NA	NA
Burkina Faso	Africa	1962	37.81400	4919632	722.5120	157.50	6.34
Burkina Faso	Africa	1967	40.69700	5127935	794.8266	150.90	6.53
Burkina Faso	Africa	1972	43.59100	5433886	854.7360	147.10	6.70
Burkina Faso	Africa	1977	46.13700	5889574	743.3870	127.40	6.98
Burkina Faso	Africa	1982	48.12200	6634596	807.1986	113.90	7.17
Burkina Faso	Africa	1987	49.55700	7586551	912.0631	105.30	7.09
Burkina Faso	Africa	1992	50.26000	8878303	931.7528	102.40	6.95
Burkina Faso	Africa	1997	50.32400	10352843	946.2950	99.40	6.75
Burkina Faso	Africa	2002	50.65000	12251209	1037.6452	93.40	6.47
Burkina Faso	Africa	2007	52.29500	14326203	1217.0330	79.20	6.12
Burundi	Africa	1952	39.03100	2445618	339.2965	NA	NA
Burundi	Africa	1957	40.53300	2667518	379.5646	NA	NA
Burundi	Africa	1962	42.04500	2961915	355.2032	144.60	7.05
Burundi	Africa	1967	43.54800	3330989	412.9775	145.30	7.25
Burundi	Africa	1972	44.05700	3529983	464.0995	146.20	7.35
Burundi	Africa	1977	45.91000	3834415	556.1033	143.00	7.45
Burundi	Africa	1982	47.47100	4580410	559.6032	120.30	7.45
Burundi	Africa	1987	48.21100	5126023	621.8188	103.30	7.57
Burundi	Africa	1992	44.73600	5809236	631.6999	104.80	7.47
Burundi	Africa	1997	45.32600	6121610	463.1151	100.00	7.22
Burundi	Africa	2002	47.36000	7021078	446.4035	88.60	6.94
Burundi	Africa	2007	49.58000	8390505	430.0707	72.70	6.57
Cambodia	Asia	1952	39.41700	4693836	368.4693	NA	NA
Cambodia	Asia	1957	41.36600	5322536	434.0383	NA	NA
Cambodia	Asia	1962	43.41500	6083619	496.9136	NA	6.96
Cambodia	Asia	1967	45.41500	6960067	523.4323	NA	6.75
Cambodia	Asia	1972	40.31700	7450606	421.6240	NA	6.17
Cambodia	Asia	1977	31.22000	6978607	524.9722	155.40	5.44
Cambodia	Asia	1982	50.95700	7272485	624.4755	98.10	6.01
Cambodia	Asia	1987	53.91400	8371791	683.8956	86.00	6.07
Cambodia	Asia	1992	55.80300	10150094	682.3032	85.70	5.24
Cambodia	Asia	1997	56.53400	11782962	734.2852	88.20	4.24
Cambodia	Asia	2002	56.75200	12926707	896.2260	68.30	3.50
Cambodia	Asia	2007	59.72300	14131858	1713.7787	46.50	3.10
Cameroon	Africa	1952	38.52300	5009067	1172.6677	NA	NA
Cameroon	Africa	1957	40.42800	5359923	1313.0481	NA	NA
Cameroon	Africa	1962	42.64300	5793633	1399.6074	160.50	5.77
Cameroon	Africa	1967	44.79900	6335506	1508.4531	143.10	6.06
Cameroon	Africa	1972	47.04900	7021028	1684.1465	118.20	6.29
Cameroon	Africa	1977	49.35500	7959865	1783.4329	113.90	6.47
Cameroon	Africa	1982	52.96100	9250831	2367.9833	103.10	6.68
Cameroon	Africa	1987	54.98500	10780667	2602.6642	87.20	6.63
Cameroon	Africa	1992	54.31400	12467171	1793.1633	88.20	6.26
Cameroon	Africa	1997	52.19900	14195809	1694.3375	94.70	5.82
Cameroon	Africa	2002	49.85600	15929988	1934.0114	86.20	5.52
Cameroon	Africa	2007	50.43000	17696293	2042.0952	73.10	5.24
Canada	Americas	1952	68.75000	14785584	11367.1611	NA	NA
Canada	Americas	1957	69.96000	17010154	12489.9501	NA	NA
Canada	Americas	1962	71.30000	18985849	13462.4855	26.00	3.77
Canada	Americas	1967	72.13000	20819767	16076.5880	21.20	2.60
Canada	Americas	1972	72.88000	22284500	18970.5709	16.70	1.97
Canada	Americas	1977	74.21000	23796400	22090.8831	12.50	1.75
Canada	Americas	1982	75.76000	25201900	22898.7921	9.20	1.64
Canada	Americas	1987	76.86000	26549700	26626.5150	7.50	1.58
Canada	Americas	1992	77.95000	28523502	26342.8843	6.40	1.71
Canada	Americas	1997	78.61000	30305843	28954.9259	5.40	1.57
Canada	Americas	2002	79.77000	31902268	33328.9651	5.30	1.51
Canada	Americas	2007	80.65300	33390141	36319.2350	5.10	1.66
Central African Republic	Africa	1952	35.46300	1291695	1071.3107	NA	NA
Central African Republic	Africa	1957	37.46400	1392284	1190.8443	NA	NA
Central African Republic	Africa	1962	39.47500	1523478	1193.0688	160.40	5.89
Central African Republic	Africa	1967	41.47800	1733638	1136.0566	145.60	5.95
Central African Republic	Africa	1972	43.45700	1927260	1070.0133	132.10	5.95
Central African Republic	Africa	1977	46.77500	2167533	1109.3743	122.60	5.95
Central African Republic	Africa	1982	48.29500	2476971	956.7530	116.70	5.96
Central African Republic	Africa	1987	50.48500	2840009	844.8764	115.50	5.90
Central African Republic	Africa	1992	49.39600	3265124	747.9055	115.10	5.69
Central African Republic	Africa	1997	46.06600	3696513	740.5063	115.10	5.55
Central African Republic	Africa	2002	43.30800	4048013	738.6906	112.10	5.33
Central African Republic	Africa	2007	44.74100	4369038	706.0165	106.90	4.90
Chad	Africa	1952	38.09200	2682462	1178.6659	NA	NA
Chad	Africa	1957	39.88100	2894855	1308.4956	NA	NA
Chad	Africa	1962	41.71600	3150417	1389.8176	NA	6.29
Chad	Africa	1967	43.60100	3495967	1196.8106	NA	6.39
Chad	Africa	1972	45.56900	3899068	1104.1040	131.80	6.64
Chad	Africa	1977	47.38300	4388260	1133.9850	128.80	6.86
Chad	Africa	1982	49.51700	4875118	797.9081	124.80	7.02
Chad	Africa	1987	51.05100	5498955	952.3861	119.30	7.20
Chad	Africa	1992	51.72400	6429417	1058.0643	113.70	7.38
Chad	Africa	1997	51.57300	7562011	1004.9614	109.10	7.42
Chad	Africa	2002	50.52500	8835739	1156.1819	103.40	7.27
Chad	Africa	2007	50.65100	10238807	1704.0637	98.10	6.90
Chile	Americas	1952	54.74500	6377619	3939.9788	NA	NA
Chile	Americas	1957	56.07400	7048426	4315.6227	NA	NA
Chile	Americas	1962	57.92400	7961258	4519.0943	116.70	5.46
Chile	Americas	1967	60.52300	8858908	5106.6543	79.00	4.59
Chile	Americas	1972	63.44100	9717524	5494.0244	65.70	3.68
Chile	Americas	1977	67.05200	10599793	4756.7638	41.70	2.89
Chile	Americas	1982	70.56500	11487112	5095.6657	22.90	2.65
Chile	Americas	1987	72.49200	12463354	5547.0638	18.40	2.65
Chile	Americas	1992	74.12600	13572994	7596.1260	13.70	2.56
Chile	Americas	1997	75.81600	14599929	10118.0532	10.20	2.25
Chile	Americas	2002	77.86000	15497046	10778.7838	8.30	2.01
Chile	Americas	2007	78.55300	16284741	13171.6388	7.60	1.90
China	Asia	1952	44.00000	556263527	400.4486	NA	NA
China	Asia	1957	50.54896	637408000	575.9870	NA	NA
China	Asia	1962	44.50136	665770000	487.6740	110.00	5.97
China	Asia	1967	58.38112	754550000	612.7057	NA	5.25
China	Asia	1972	63.11888	862030000	676.9001	73.30	4.92
China	Asia	1977	63.96736	943455000	741.2375	55.80	2.87
China	Asia	1982	65.52500	1000281000	962.4214	44.60	2.62
China	Asia	1987	67.27400	1084035000	1378.9040	42.00	2.68
China	Asia	1992	68.69000	1164970000	1655.7842	41.20	2.11
China	Asia	1997	70.42600	1230075000	2289.2341	35.00	1.52
China	Asia	2002	72.02800	1280400000	3119.2809	26.20	1.47
China	Asia	2007	72.96100	1318683096	4959.1149	17.20	1.53
Colombia	Americas	1952	50.64300	12350771	2144.1151	NA	NA
Colombia	Americas	1957	55.11800	14485993	2323.8056	NA	NA
Colombia	Americas	1962	57.86300	17009885	2492.3511	85.90	6.78
Colombia	Americas	1967	59.96300	19764027	2678.7298	77.10	6.25
Colombia	Americas	1972	61.62300	22542890	3264.6600	65.90	5.15
Colombia	Americas	1977	63.83700	25094412	3815.8079	52.80	4.37
Colombia	Americas	1982	66.65300	27764644	4397.5757	39.70	3.74
Colombia	Americas	1987	67.76800	30964245	4903.2191	31.50	3.28
Colombia	Americas	1992	68.42100	34202721	5444.6486	27.40	3.01
Colombia	Americas	1997	70.31300	37657830	6117.3617	23.40	2.78
Colombia	Americas	2002	71.68200	41008227	5755.2600	20.00	2.57
Colombia	Americas	2007	72.88900	44227550	7006.5804	17.30	2.45
Comoros	Africa	1952	40.71500	153936	1102.9909	NA	NA
Comoros	Africa	1957	42.46000	170928	1211.1485	NA	NA
Comoros	Africa	1962	44.46700	191689	1406.6483	NA	6.90
Comoros	Africa	1967	46.47200	217378	1876.0296	NA	7.04
Comoros	Africa	1972	48.94400	250027	1937.5777	145.10	7.06
Comoros	Africa	1977	50.93900	304739	1172.6030	129.60	7.08
Comoros	Africa	1982	52.93300	348643	1267.1001	111.90	7.03
Comoros	Africa	1987	54.92600	395114	1315.9808	95.80	6.14
Comoros	Africa	1992	57.93900	454429	1246.9074	82.90	5.36
Comoros	Africa	1997	60.66000	527982	1173.6182	74.50	5.27
Comoros	Africa	2002	62.97400	614382	1075.8116	72.50	5.30
Comoros	Africa	2007	65.15200	710960	986.1479	67.90	5.11
Congo, Dem. Rep.	Africa	1952	39.14300	14100005	780.5423	NA	NA
Congo, Dem. Rep.	Africa	1957	40.65200	15577932	905.8602	NA	NA
Congo, Dem. Rep.	Africa	1962	42.12200	17486434	896.3146	NA	6.03
Congo, Dem. Rep.	Africa	1967	44.05600	19941073	861.5932	NA	6.14
Congo, Dem. Rep.	Africa	1972	45.98900	23007669	904.8961	145.90	6.27
Congo, Dem. Rep.	Africa	1977	47.80400	26480870	795.7573	137.10	6.44
Congo, Dem. Rep.	Africa	1982	47.78400	30646495	673.7478	129.00	6.69
Congo, Dem. Rep.	Africa	1987	47.41200	35481645	672.7748	122.90	6.96
Congo, Dem. Rep.	Africa	1992	45.54800	41672143	457.7192	117.70	7.22
Congo, Dem. Rep.	Africa	1997	42.58700	47798986	312.1884	112.50	7.23
Congo, Dem. Rep.	Africa	2002	44.96600	55379852	241.1659	103.10	6.96
Congo, Dem. Rep.	Africa	2007	46.46200	64606759	277.5519	91.50	6.55
Congo, Rep.	Africa	1952	42.11100	854885	2125.6214	NA	NA
Congo, Rep.	Africa	1957	45.05300	940458	2315.0566	NA	NA
Congo, Rep.	Africa	1962	48.43500	1047924	2464.7832	106.10	5.97
Congo, Rep.	Africa	1967	52.04000	1179760	2677.9396	94.90	6.17
Congo, Rep.	Africa	1972	54.90700	1340458	3213.1527	84.40	6.30
Congo, Rep.	Africa	1977	55.62500	1536769	3259.1790	76.00	6.30
Congo, Rep.	Africa	1982	56.69500	1774735	4879.5075	68.00	6.04
Congo, Rep.	Africa	1987	57.47000	2064095	4201.1949	60.90	5.59
Congo, Rep.	Africa	1992	56.43300	2409073	4016.2395	63.00	5.24
Congo, Rep.	Africa	1997	52.96200	2800947	3484.1644	73.50	5.14
Congo, Rep.	Africa	2002	52.97000	3328795	3484.0620	73.30	5.13
Congo, Rep.	Africa	2007	55.32200	3800610	3632.5578	53.10	5.11
Costa Rica	Americas	1952	57.20600	926317	2627.0095	NA	NA
Costa Rica	Americas	1957	60.02600	1112300	2990.0108	NA	NA
Costa Rica	Americas	1962	62.84200	1345187	3460.9370	80.64	7.22
Costa Rica	Americas	1967	65.42400	1588717	4161.7278	64.60	6.00
Costa Rica	Americas	1972	67.84900	1834796	5118.1469	52.50	4.49
Costa Rica	Americas	1977	70.75000	2108457	5926.8770	28.10	3.78
Costa Rica	Americas	1982	73.45000	2424367	5262.7348	19.20	3.54
Costa Rica	Americas	1987	74.75200	2799811	5629.9153	16.30	3.38
Costa Rica	Americas	1992	75.71300	3173216	6160.4163	13.70	3.00
Costa Rica	Americas	1997	77.26000	3518107	6677.0453	12.70	2.62
Costa Rica	Americas	2002	78.12300	3834934	7723.4472	10.00	2.28
Costa Rica	Americas	2007	78.78200	4133884	9645.0614	8.90	1.95
Cote d’Ivoire	Africa	1952	40.47700	2977019	1388.5947	NA	NA
Cote d’Ivoire	Africa	1957	42.46900	3300000	1500.8959	NA	NA
Cote d’Ivoire	Africa	1962	44.93000	3832408	1728.8694	197.70	7.50
Cote d’Ivoire	Africa	1967	47.35000	4744870	2052.0505	174.20	7.81
Cote d’Ivoire	Africa	1972	49.80100	6071696	2378.2011	151.30	7.94
Cote d’Ivoire	Africa	1977	52.37400	7459574	2517.7365	124.70	7.84
Cote d’Ivoire	Africa	1982	53.98300	9025951	2602.7102	109.50	7.38
Cote d’Ivoire	Africa	1987	54.65500	10761098	2156.9561	105.20	6.75
Cote d’Ivoire	Africa	1992	52.04400	12772596	1648.0738	104.70	6.11
Cote d’Ivoire	Africa	1997	47.99100	14625967	1786.2654	103.30	5.63
Cote d’Ivoire	Africa	2002	46.83200	16252726	1648.8008	95.70	5.21
Cote d’Ivoire	Africa	2007	48.32800	18013409	1544.7501	84.10	4.93
Croatia	Europe	1952	61.21000	3882229	3119.2365	NA	NA
Croatia	Europe	1957	64.77000	3991242	4338.2316	NA	NA
Croatia	Europe	1962	67.13000	4076557	5477.8900	NA	2.27
Croatia	Europe	1967	68.50000	4174366	6960.2979	NA	2.10
Croatia	Europe	1972	69.61000	4225310	9164.0901	NA	1.98
Croatia	Europe	1977	70.64000	4318673	11305.3852	NA	2.01
Croatia	Europe	1982	70.46000	4413368	13221.8218	18.40	1.98
Croatia	Europe	1987	71.52000	4484310	13822.5839	13.80	1.84
Croatia	Europe	1992	72.52700	4494013	8447.7949	9.90	1.57
Croatia	Europe	1997	73.68000	4444595	9875.6045	8.00	1.51
Croatia	Europe	2002	74.87600	4481020	11628.3890	6.60	1.39
Croatia	Europe	2007	75.74800	4493312	14619.2227	5.30	1.41
Cuba	Americas	1952	59.42100	6007797	5586.5388	NA	NA
Cuba	Americas	1957	62.32500	6640752	6092.1744	NA	NA
Cuba	Americas	1962	65.24600	7254373	5180.7559	NA	4.51
Cuba	Americas	1967	68.29000	8139332	5690.2680	39.30	4.43
Cuba	Americas	1972	70.72300	8831348	5305.4453	30.90	3.65
Cuba	Americas	1977	72.64900	9537988	6380.4950	20.80	2.33
Cuba	Americas	1982	73.71700	9789224	7316.9181	16.30	1.83
Cuba	Americas	1987	74.17400	10239839	7532.9248	13.30	1.83
Cuba	Americas	1992	74.41400	10723260	5592.8440	9.30	1.68
Cuba	Americas	1997	76.15100	10983007	5431.9904	7.80	1.61
Cuba	Americas	2002	77.15800	11226999	6340.6467	5.90	1.62
Cuba	Americas	2007	78.27300	11416987	8948.1029	4.80	1.52
Czech Republic	Europe	1952	66.87000	9125183	6876.1403	NA	NA
Czech Republic	Europe	1957	69.03000	9513758	8256.3439	NA	NA
Czech Republic	Europe	1962	69.90000	9620282	10136.8671	NA	2.23
Czech Republic	Europe	1967	70.38000	9835109	11399.4449	NA	2.00
Czech Republic	Europe	1972	70.29000	9862158	13108.4536	NA	2.15
Czech Republic	Europe	1977	70.71000	10161915	14800.1606	NA	2.30
Czech Republic	Europe	1982	70.96000	10303704	15377.2285	16.00	2.07
Czech Republic	Europe	1987	71.58000	10311597	16310.4434	14.30	1.93
Czech Republic	Europe	1992	72.40000	10315702	14297.0212	11.50	1.68
Czech Republic	Europe	1997	74.01000	10300707	16048.5142	7.20	1.23
Czech Republic	Europe	2002	75.51000	10256295	17596.2102	5.10	1.17
Czech Republic	Europe	2007	76.48600	10228744	22833.3085	3.90	1.39
Denmark	Europe	1952	70.78000	4334000	9692.3852	NA	NA
Denmark	Europe	1957	71.81000	4487831	11099.6593	NA	NA
Denmark	Europe	1962	72.35000	4646899	13583.3135	20.20	2.54
Denmark	Europe	1967	72.96000	4838800	15937.2112	16.10	2.35
Denmark	Europe	1972	73.47000	4991596	18866.2072	12.50	2.03
Denmark	Europe	1977	74.69000	5088419	20422.9015	9.20	1.66
Denmark	Europe	1982	74.63000	5117810	21688.0405	8.00	1.43
Denmark	Europe	1987	74.80000	5127024	25116.1758	8.00	1.50
Denmark	Europe	1992	75.33000	5171393	26406.7399	6.50	1.76
Denmark	Europe	1997	76.11000	5283663	29804.3457	5.00	1.75
Denmark	Europe	2002	77.18000	5374693	32166.5001	4.50	1.72
Denmark	Europe	2007	78.33200	5468120	35278.4187	3.70	1.85
Djibouti	Africa	1952	34.81200	63149	2669.5295	NA	NA
Djibouti	Africa	1957	37.32800	71851	2864.9691	NA	NA
Djibouti	Africa	1962	39.69300	89898	3020.9893	NA	6.53
Djibouti	Africa	1967	42.07400	127617	3020.0505	NA	6.70
Djibouti	Africa	1972	44.36600	178848	3694.2124	NA	6.84
Djibouti	Africa	1977	46.51900	228694	3081.7610	127.60	6.67
Djibouti	Africa	1982	48.81200	305991	2879.4681	112.20	6.32
Djibouti	Africa	1987	50.04000	311025	2880.1026	98.90	6.19
Djibouti	Africa	1992	51.60400	384156	2377.1562	89.60	5.88
Djibouti	Africa	1997	53.15700	417908	1895.0170	83.90	4.95
Djibouti	Africa	2002	53.37300	447416	1908.2609	76.40	4.25
Djibouti	Africa	2007	54.79100	496374	2082.4816	67.50	3.83
Dominican Republic	Americas	1952	45.92800	2491346	1397.7171	NA	NA
Dominican Republic	Americas	1957	49.82800	2923186	1544.4030	NA	NA
Dominican Republic	Americas	1962	53.45900	3453434	1662.1374	99.60	7.40
Dominican Republic	Americas	1967	56.75100	4049146	1653.7230	91.10	6.74
Dominican Republic	Americas	1972	59.63100	4671329	2189.8745	81.60	5.78
Dominican Republic	Americas	1977	61.78800	5302800	2681.9889	70.30	4.85
Dominican Republic	Americas	1982	63.72700	5968349	2861.0924	60.00	4.19
Dominican Republic	Americas	1987	66.04600	6655297	2899.8422	51.30	3.70
Dominican Republic	Americas	1992	68.45700	7351181	3044.2142	43.30	3.33
Dominican Republic	Americas	1997	69.95700	7992357	3614.1013	36.40	3.01
Dominican Republic	Americas	2002	70.84700	8650322	4563.8082	31.80	2.84
Dominican Republic	Americas	2007	72.23500	9319622	6025.3748	29.10	2.69
Ecuador	Americas	1952	48.35700	3548753	3522.1107	NA	NA
Ecuador	Americas	1957	51.35600	4058385	3780.5467	NA	NA
Ecuador	Americas	1962	54.64000	4681707	4086.1141	115.30	6.65
Ecuador	Americas	1967	56.67800	5432424	4579.0742	102.40	6.42
Ecuador	Americas	1972	58.79600	6298651	5280.9947	91.20	5.87
Ecuador	Americas	1977	61.31000	7278866	6679.6233	76.50	5.16
Ecuador	Americas	1982	64.34200	8365850	7213.7913	62.50	4.51
Ecuador	Americas	1987	67.23100	9545158	6481.7770	50.10	4.04
Ecuador	Americas	1992	69.61300	10748394	7103.7026	40.50	3.58
Ecuador	Americas	1997	72.31200	11911819	7429.4559	32.10	3.21
Ecuador	Americas	2002	74.17300	12921234	5773.0445	26.50	2.98
Ecuador	Americas	2007	74.99400	13755680	6873.2623	23.10	2.77
Egypt	Africa	1952	41.89300	22223309	1418.8224	NA	NA
Egypt	Africa	1957	44.44400	25009741	1458.9153	NA	NA
Egypt	Africa	1962	46.99200	28173309	1693.3359	195.90	6.57
Egypt	Africa	1967	49.29300	31681188	1814.8807	169.90	6.24
Egypt	Africa	1972	51.13700	34807417	2024.0081	156.80	5.76
Egypt	Africa	1977	53.31900	38783863	2785.4936	132.10	5.51
Egypt	Africa	1982	56.00600	45681811	3503.7296	102.60	5.25
Egypt	Africa	1987	59.79700	52799062	3885.4607	73.50	4.83
Egypt	Africa	1992	63.67400	59402198	3794.7552	57.60	4.02
Egypt	Africa	1997	67.21700	66134291	4173.1818	44.00	3.51
Egypt	Africa	2002	69.80600	73312559	4754.6044	33.40	3.18
Egypt	Africa	2007	71.33800	80264543	5581.1810	27.10	2.99
El Salvador	Americas	1952	45.26200	2042865	3048.3029	NA	NA
El Salvador	Americas	1957	48.57000	2355805	3421.5232	NA	NA
El Salvador	Americas	1962	52.30700	2747687	3776.8036	121.60	6.75
El Salvador	Americas	1967	55.85500	3232927	4358.5954	111.80	6.49
El Salvador	Americas	1972	58.20700	3790903	4520.2460	102.90	6.01
El Salvador	Americas	1977	56.69600	4282586	5138.9224	89.60	5.51
El Salvador	Americas	1982	56.60400	4474873	4098.3442	70.80	4.87
El Salvador	Americas	1987	63.15400	4842194	4140.4421	53.30	4.26
El Salvador	Americas	1992	66.79800	5274649	4444.2317	41.70	3.78
El Salvador	Americas	1997	69.53500	5783439	5154.8255	31.80	3.32
El Salvador	Americas	2002	70.73400	6353681	5351.5687	24.20	2.68
El Salvador	Americas	2007	71.87800	6939688	5728.3535	19.20	2.35
Equatorial Guinea	Africa	1952	34.48200	216964	375.6431	NA	NA
Equatorial Guinea	Africa	1957	35.98300	232922	426.0964	NA	NA
Equatorial Guinea	Africa	1962	37.48500	249220	582.8420	NA	5.53
Equatorial Guinea	Africa	1967	38.98700	259864	915.5960	NA	5.64
Equatorial Guinea	Africa	1972	40.51600	277603	672.4123	NA	5.68
Equatorial Guinea	Africa	1977	42.02400	192675	958.5668	NA	5.68
Equatorial Guinea	Africa	1982	43.66200	285483	927.8253	145.10	5.78
Equatorial Guinea	Africa	1987	45.66400	341244	966.8968	135.30	5.88
Equatorial Guinea	Africa	1992	47.54500	387838	1132.0550	123.10	5.90
Equatorial Guinea	Africa	1997	48.24500	439971	2814.4808	112.10	5.87
Equatorial Guinea	Africa	2002	49.34800	495627	7703.4959	99.70	5.68
Equatorial Guinea	Africa	2007	51.57900	551201	12154.0897	86.30	5.39
Eritrea	Africa	1952	35.92800	1438760	328.9406	NA	NA
Eritrea	Africa	1957	38.04700	1542611	344.1619	NA	NA
Eritrea	Africa	1962	40.15800	1666618	380.9958	NA	6.84
Eritrea	Africa	1967	42.18900	1820319	468.7950	NA	6.71
Eritrea	Africa	1972	44.14200	2260187	514.3242	124.80	6.63
Eritrea	Africa	1977	44.53500	2512642	505.7538	119.50	6.62
Eritrea	Africa	1982	43.89000	2637297	524.8758	111.10	6.62
Eritrea	Africa	1987	46.45300	2915959	521.1341	101.60	6.54
Eritrea	Africa	1992	49.99100	3668440	582.8585	85.80	6.44
Eritrea	Africa	1997	53.37800	4058319	913.4708	67.20	6.16
Eritrea	Africa	2002	55.24000	4414865	765.3500	53.40	5.77
Eritrea	Africa	2007	58.04000	4906585	641.3695	43.70	5.27
Ethiopia	Africa	1952	34.07800	20860941	362.1463	NA	NA
Ethiopia	Africa	1957	36.66700	22815614	378.9042	NA	NA
Ethiopia	Africa	1962	40.05900	25145372	419.4564	NA	6.88
Ethiopia	Africa	1967	42.11500	27860297	516.1186	142.70	6.88
Ethiopia	Africa	1972	43.51500	30770372	566.2439	142.50	7.06
Ethiopia	Africa	1977	44.51000	34617799	556.8084	143.40	7.20
Ethiopia	Africa	1982	44.91600	38111756	577.8607	139.50	7.40
Ethiopia	Africa	1987	46.68400	42999530	573.7413	127.60	7.39
Ethiopia	Africa	1992	48.09100	52088559	421.3535	116.40	7.14
Ethiopia	Africa	1997	49.40200	59861301	515.8894	98.70	6.86
Ethiopia	Africa	2002	50.72500	67946797	530.0535	82.50	6.22
Ethiopia	Africa	2007	52.94700	76511887	690.8056	61.00	5.35
Finland	Europe	1952	66.55000	4090500	6424.5191	NA	NA
Finland	Europe	1957	67.49000	4324000	7545.4154	NA	NA
Finland	Europe	1962	68.75000	4491443	9371.8426	19.50	2.66
Finland	Europe	1967	69.83000	4605744	10921.6363	15.10	2.32
Finland	Europe	1972	70.87000	4639657	14358.8759	12.00	1.59
Finland	Europe	1977	72.52000	4738902	15605.4228	8.70	1.69
Finland	Europe	1982	74.55000	4826933	18533.1576	6.50	1.72
Finland	Europe	1987	74.83000	4931729	21141.0122	5.90	1.59
Finland	Europe	1992	75.70000	5041039	20647.1650	5.00	1.85
Finland	Europe	1997	77.13000	5134406	23723.9502	3.90	1.75
Finland	Europe	2002	78.37000	5193039	28204.5906	3.40	1.72
Finland	Europe	2007	79.31300	5238460	33207.0844	2.90	1.83
France	Europe	1952	67.41000	42459667	7029.8093	NA	NA
France	Europe	1957	68.93000	44310863	8662.8349	NA	NA
France	Europe	1962	70.51000	47124000	10560.4855	21.30	2.81
France	Europe	1967	71.55000	49569000	12999.9177	17.10	2.68
France	Europe	1972	72.38000	51732000	16107.1917	13.70	2.33
France	Europe	1977	73.83000	53165019	18292.6351	11.50	1.92
France	Europe	1982	74.89000	54433565	20293.8975	9.50	1.84
France	Europe	1987	76.34000	55630100	22066.4421	8.10	1.81
France	Europe	1992	77.46000	57374179	24703.7961	6.70	1.72
France	Europe	1997	78.64000	58623428	25889.7849	4.80	1.75
France	Europe	2002	79.59000	59925035	28926.0323	4.20	1.87
France	Europe	2007	80.65700	61083916	30470.0167	3.60	1.96
Gabon	Africa	1952	37.00300	420702	4293.4765	NA	NA
Gabon	Africa	1957	38.99900	434904	4976.1981	NA	NA
Gabon	Africa	1962	40.48900	455661	6631.4592	NA	4.54
Gabon	Africa	1967	44.59800	489004	8358.7620	NA	4.90
Gabon	Africa	1972	48.69000	537977	11401.9484	NA	5.21
Gabon	Africa	1977	52.79000	706367	21745.5733	NA	5.54
Gabon	Africa	1982	56.56400	753874	15113.3619	69.80	5.72
Gabon	Africa	1987	60.19000	880397	11864.4084	62.50	5.61
Gabon	Africa	1992	61.36600	985739	13522.1575	59.60	5.26
Gabon	Africa	1997	60.46100	1126189	14722.8419	57.30	4.81
Gabon	Africa	2002	56.76100	1299304	12521.7139	53.70	4.49
Gabon	Africa	2007	56.73500	1454867	13206.4845	47.40	4.30
Gambia	Africa	1952	30.00000	284320	485.2307	NA	NA
Gambia	Africa	1957	32.06500	323150	520.9267	NA	NA
Gambia	Africa	1962	33.89600	374020	599.6503	143.80	5.67
Gambia	Africa	1967	35.85700	439593	734.7829	132.60	5.94
Gambia	Africa	1972	38.30800	517101	756.0868	121.50	6.19
Gambia	Africa	1977	41.84200	608274	884.7553	109.80	6.33
Gambia	Africa	1982	45.58000	715523	835.8096	98.60	6.30
Gambia	Africa	1987	49.26500	848406	611.6589	86.50	6.16
Gambia	Africa	1992	52.64400	1025384	665.6244	76.10	6.08
Gambia	Africa	1997	55.86100	1235767	653.7302	67.70	6.00
Gambia	Africa	2002	58.04100	1457766	660.5856	60.60	5.87
Gambia	Africa	2007	59.44800	1688359	752.7497	54.50	5.80
Germany	Europe	1952	67.50000	69145952	7144.1144	NA	NA
Germany	Europe	1957	69.10000	71019069	10187.8267	NA	NA
Germany	Europe	1962	70.30000	73739117	12902.4629	NA	2.47
Germany	Europe	1967	70.80000	76368453	14745.6256	NA	2.37
Germany	Europe	1972	71.00000	78717088	18016.1803	20.60	1.80
Germany	Europe	1977	72.50000	78160773	20512.9212	15.50	1.50
Germany	Europe	1982	73.80000	78335266	22031.5327	11.00	1.46
Germany	Europe	1987	74.84700	77718298	24639.1857	8.30	1.43
Germany	Europe	1992	76.07000	80597764	26505.3032	6.20	1.32
Germany	Europe	1997	77.34000	82011073	27788.8842	4.80	1.33
Germany	Europe	2002	78.67000	82350671	30035.8020	4.20	1.35
Germany	Europe	2007	79.40600	82400996	32170.3744	3.70	1.36
Ghana	Africa	1952	43.14900	5581001	911.2989	NA	NA
Ghana	Africa	1957	44.77900	6391288	1043.5615	NA	NA
Ghana	Africa	1962	46.45200	7355248	1190.0411	122.70	6.83
Ghana	Africa	1967	48.07200	8490213	1125.6972	120.60	6.95
Ghana	Africa	1972	49.87500	9354120	1178.2237	118.20	6.92
Ghana	Africa	1977	51.75600	10538093	993.2240	106.00	6.72
Ghana	Africa	1982	53.74400	11400338	876.0326	99.30	6.39
Ghana	Africa	1987	55.72900	14168101	847.0061	89.00	5.94
Ghana	Africa	1992	57.50100	16278738	925.0602	75.60	5.39
Ghana	Africa	1997	58.55600	18418288	1005.2458	69.80	4.87
Ghana	Africa	2002	58.45300	20550751	1111.9846	61.20	4.57
Ghana	Africa	2007	60.02200	22873338	1327.6089	54.40	4.26
Greece	Europe	1952	65.86000	7733250	3530.6901	NA	NA
Greece	Europe	1957	67.86000	8096218	4916.2999	NA	NA
Greece	Europe	1962	69.51000	8448233	6017.1907	46.20	2.22
Greece	Europe	1967	71.00000	8716441	8513.0970	39.90	2.35
Greece	Europe	1972	72.34000	8888628	12724.8296	30.80	2.35
Greece	Europe	1977	73.68000	9308479	14195.5243	25.90	2.32
Greece	Europe	1982	75.24000	9786480	15268.4209	18.70	2.01
Greece	Europe	1987	76.67000	9974490	16120.5284	13.90	1.58
Greece	Europe	1992	77.03000	10325429	17541.4963	10.30	1.37
Greece	Europe	1997	77.86900	10502372	18747.6981	8.30	1.29
Greece	Europe	2002	78.25600	10603863	22514.2548	6.00	1.28
Greece	Europe	2007	79.48300	10706290	27538.4119	4.40	1.43
Guatemala	Americas	1952	42.02300	3146381	2428.2378	NA	NA
Guatemala	Americas	1957	44.14200	3640876	2617.1560	NA	NA
Guatemala	Americas	1962	46.95400	4208858	2750.3644	140.70	6.49
Guatemala	Americas	1967	50.01600	4690773	3242.5311	127.10	6.32
Guatemala	Americas	1972	53.73800	5149581	4031.4083	112.10	6.21
Guatemala	Americas	1977	56.02900	5703430	4879.9927	96.80	6.20
Guatemala	Americas	1982	58.13700	6395630	4820.4948	81.80	6.11
Guatemala	Americas	1987	60.78200	7326406	4246.4860	67.70	5.76
Guatemala	Americas	1992	63.37300	8486949	4439.4508	55.00	5.47
Guatemala	Americas	1997	66.32200	9803875	4684.3138	44.70	5.06
Guatemala	Americas	2002	68.97800	11178650	4858.3475	37.10	4.63
Guatemala	Americas	2007	70.25900	12572928	5186.0500	31.20	4.20
Guinea	Africa	1952	33.60900	2664249	510.1965	NA	NA
Guinea	Africa	1957	34.55800	2876726	576.2670	NA	NA
Guinea	Africa	1962	35.75300	3140003	686.3737	209.10	6.12
Guinea	Africa	1967	37.19700	3451418	708.7595	200.90	6.15
Guinea	Africa	1972	38.84200	3811387	741.6662	191.10	6.25
Guinea	Africa	1977	40.76200	4227026	874.6859	179.10	6.43
Guinea	Africa	1982	42.89100	4710497	857.2504	164.30	6.59
Guinea	Africa	1987	45.55200	5650262	805.5725	150.00	6.64
Guinea	Africa	1992	48.57600	6990574	794.3484	133.70	6.49
Guinea	Africa	1997	51.45500	8048834	869.4498	114.70	6.16
Guinea	Africa	2002	53.67600	8807818	945.5836	95.40	5.79
Guinea	Africa	2007	56.00700	9947814	942.6542	79.00	5.42
Guinea-Bissau	Africa	1952	32.50000	580653	299.8503	NA	NA
Guinea-Bissau	Africa	1957	33.48900	601095	431.7905	NA	NA
Guinea-Bissau	Africa	1962	34.48800	627820	522.0344	NA	5.67
Guinea-Bissau	Africa	1967	35.49200	601287	715.5806	NA	5.09
Guinea-Bissau	Africa	1972	36.48600	625361	820.2246	NA	6.81
Guinea-Bissau	Africa	1977	37.46500	745228	764.7260	135.30	6.46
Guinea-Bissau	Africa	1982	39.32700	825987	838.1240	130.70	6.54
Guinea-Bissau	Africa	1987	41.24500	927524	736.4154	143.10	6.73
Guinea-Bissau	Africa	1992	43.26600	1050938	745.5399	130.20	6.55
Guinea-Bissau	Africa	1997	44.87300	1193708	796.6645	116.20	6.12
Guinea-Bissau	Africa	2002	45.50400	1332459	575.7047	100.50	5.69
Guinea-Bissau	Africa	2007	46.38800	1472041	579.2317	83.30	5.32
Haiti	Americas	1952	37.57900	3201488	1840.3669	NA	NA
Haiti	Americas	1957	40.69600	3507701	1726.8879	NA	NA
Haiti	Americas	1962	43.59000	3880130	1796.5890	188.30	6.30
Haiti	Americas	1967	46.24300	4318137	1452.0577	172.90	6.03
Haiti	Americas	1972	48.04200	4698301	1654.4569	156.60	5.64
Haiti	Americas	1977	49.92300	4908554	1874.2989	139.20	5.78
Haiti	Americas	1982	51.46100	5198399	2011.1595	123.00	6.15
Haiti	Americas	1987	53.63600	5756203	1823.0160	108.80	5.80
Haiti	Americas	1992	55.08900	6326682	1456.3095	95.80	5.21
Haiti	Americas	1997	56.67100	6913545	1341.7269	82.40	4.67
Haiti	Americas	2002	58.13700	7607651	1270.3649	70.70	4.07
Haiti	Americas	2007	60.91600	8502814	1201.6372	62.70	3.58
Honduras	Americas	1952	41.91200	1517453	2194.9262	NA	NA
Honduras	Americas	1957	44.66500	1770390	2220.4877	NA	NA
Honduras	Americas	1962	48.04100	2090162	2291.1568	132.40	7.44
Honduras	Americas	1967	50.92400	2500689	2538.2694	113.10	7.42
Honduras	Americas	1972	53.88400	2965146	2529.8423	95.20	7.11
Honduras	Americas	1977	57.40200	3055235	3203.2081	78.50	6.65
Honduras	Americas	1982	60.90900	3669448	3121.7608	63.50	6.06
Honduras	Americas	1987	64.49200	4372203	3023.0967	51.20	5.44
Honduras	Americas	1992	66.39900	5077347	3081.6946	41.50	4.95
Honduras	Americas	1997	67.65900	5867957	3160.4549	34.30	4.37
Honduras	Americas	2002	68.56500	6677328	3099.7287	28.20	3.78
Honduras	Americas	2007	70.19800	7483763	3548.3308	23.20	3.34
Hong Kong, China	Asia	1952	60.96000	2125900	3054.4212	NA	NA
Hong Kong, China	Asia	1957	64.75000	2736300	3629.0765	NA	NA
Hong Kong, China	Asia	1962	67.65000	3305200	4692.6483	NA	5.18
Hong Kong, China	Asia	1967	70.00000	3722800	6197.9628	NA	3.96
Hong Kong, China	Asia	1972	72.00000	4115700	8315.9281	NA	3.24
Hong Kong, China	Asia	1977	73.60000	4583700	11186.1413	NA	2.44
Hong Kong, China	Asia	1982	75.45000	5264500	14560.5305	NA	1.75
Hong Kong, China	Asia	1987	76.20000	5584510	20038.4727	NA	1.39
Hong Kong, China	Asia	1992	77.60100	5829696	24757.6030	NA	1.22
Hong Kong, China	Asia	1997	80.00000	6495918	28377.6322	NA	0.92
Hong Kong, China	Asia	2002	81.49500	6762476	30209.0152	NA	0.92
Hong Kong, China	Asia	2007	82.20800	6980412	39724.9787	NA	1.02
Hungary	Europe	1952	64.03000	9504000	5263.6738	NA	NA
Hungary	Europe	1957	66.41000	9839000	6040.1800	NA	NA
Hungary	Europe	1962	67.96000	10063000	7550.3599	49.00	1.92
Hungary	Europe	1967	69.50000	10223422	9326.6447	42.00	1.95
Hungary	Europe	1972	69.76000	10394091	10168.6561	38.40	2.07
Hungary	Europe	1977	69.95000	10637171	11674.8374	29.40	2.11
Hungary	Europe	1982	69.39000	10705535	12545.9907	22.00	1.88
Hungary	Europe	1987	69.58000	10612740	12986.4800	19.40	1.84
Hungary	Europe	1992	69.17000	10348684	10535.6285	15.40	1.75
Hungary	Europe	1997	71.04000	10244684	11712.7768	11.10	1.43
Hungary	Europe	2002	72.59000	10083313	14843.9356	8.60	1.29
Hungary	Europe	2007	73.33800	9956108	18008.9444	6.50	1.32
Iceland	Europe	1952	72.49000	147962	7267.6884	NA	NA
Iceland	Europe	1957	73.47000	165110	9244.0014	NA	NA
Iceland	Europe	1962	73.68000	182053	10350.1591	16.90	3.98
Iceland	Europe	1967	73.73000	198676	13319.8957	14.40	3.34
Iceland	Europe	1972	74.46000	209275	15798.0636	11.80	2.88
Iceland	Europe	1977	76.11000	221823	19654.9625	9.20	2.49
Iceland	Europe	1982	76.99000	233997	23269.6075	7.00	2.23
Iceland	Europe	1987	77.23000	244676	26923.2063	5.60	2.13
Iceland	Europe	1992	78.77000	259012	25144.3920	4.70	2.17
Iceland	Europe	1997	78.95000	271192	28061.0997	3.70	2.07
Iceland	Europe	2002	80.50000	288030	31163.2020	2.80	2.00
Iceland	Europe	2007	81.75700	301931	36180.7892	2.20	2.11
India	Asia	1952	37.37300	372000000	546.5657	NA	NA
India	Asia	1957	40.24900	409000000	590.0620	NA	NA
India	Asia	1962	43.60500	454000000	658.3472	160.10	5.84
India	Asia	1967	47.19300	506000000	700.7706	148.90	5.70
India	Asia	1972	50.65100	567000000	724.0325	138.30	5.32
India	Asia	1977	54.20800	634000000	813.3373	124.00	4.92
India	Asia	1982	56.59600	708000000	855.7235	108.40	4.52
India	Asia	1987	58.55300	788000000	976.5127	95.60	4.13
India	Asia	1992	60.22300	872000000	1164.4068	83.90	3.71
India	Asia	1997	61.76500	959000000	1458.8174	73.10	3.33
India	Asia	2002	62.87900	1034172547	1746.7695	62.00	3.02
India	Asia	2007	64.69800	1110396331	2452.2104	51.90	2.69
Indonesia	Asia	1952	37.46800	82052000	749.6817	NA	NA
Indonesia	Asia	1957	39.91800	90124000	858.9003	NA	NA
Indonesia	Asia	1962	42.51800	99028000	849.2898	141.20	5.65
Indonesia	Asia	1967	45.96400	109343000	762.4318	123.40	5.58
Indonesia	Asia	1972	49.20300	121282000	1111.1079	106.70	5.34
Indonesia	Asia	1977	52.70200	136725000	1382.7021	92.50	4.81
Indonesia	Asia	1982	56.15900	153343000	1516.8730	80.80	4.17
Indonesia	Asia	1987	60.13700	169276000	1748.3570	69.30	3.47
Indonesia	Asia	1992	62.68100	184816000	2383.1409	57.40	2.93
Indonesia	Asia	1997	66.04100	199278000	3119.3356	46.70	2.58
Indonesia	Asia	2002	68.58800	211060000	2873.9129	37.80	2.47
Indonesia	Asia	2007	70.65000	223547000	3540.6516	30.90	2.49
Iran	Asia	1952	44.86900	17272000	3035.3260	NA	NA
Iran	Asia	1957	47.18100	19792000	3290.2576	NA	NA
Iran	Asia	1962	49.32500	22874000	4187.3298	176.37	6.91
Iran	Asia	1967	52.46900	26538000	5906.7318	191.30	6.70
Iran	Asia	1972	55.23400	30614000	9613.8186	120.70	6.29
Iran	Asia	1977	57.70200	35480679	11888.5951	95.00	6.29
Iran	Asia	1982	59.62000	43072751	7608.3346	68.50	6.52
Iran	Asia	1987	63.04000	51889696	6642.8814	51.90	5.76
Iran	Asia	1992	65.74200	60397973	7235.6532	40.80	4.14
Iran	Asia	1997	68.04200	63327987	8263.5903	33.20	2.72
Iran	Asia	2002	69.45100	66907826	9240.7620	25.60	1.99
Iran	Asia	2007	70.96400	69453570	11605.7145	19.40	1.87
Iraq	Asia	1952	45.32000	5441766	4129.7661	NA	NA
Iraq	Asia	1957	48.43700	6248643	6229.3336	NA	NA
Iraq	Asia	1962	51.45700	7240260	8341.7378	118.30	6.51
Iraq	Asia	1967	54.45900	8519282	8931.4598	93.00	7.30
Iraq	Asia	1972	56.95000	10061506	9576.0376	74.90	7.23
Iraq	Asia	1977	60.41300	11882916	14688.2351	61.20	6.83
Iraq	Asia	1982	62.03800	14173318	14517.9071	51.60	6.41
Iraq	Asia	1987	65.04400	16543189	11643.5727	45.10	6.11
Iraq	Asia	1992	59.46100	17861905	3745.6407	40.80	5.70
Iraq	Asia	1997	58.81100	20775703	3076.2398	37.60	5.23
Iraq	Asia	2002	57.04600	24001816	4390.7173	34.60	4.80
Iraq	Asia	2007	59.54500	27499638	4471.0619	31.80	4.41
Ireland	Europe	1952	66.91000	2952156	5210.2803	NA	NA
Ireland	Europe	1957	68.90000	2878220	5599.0779	NA	NA
Ireland	Europe	1962	70.29000	2830000	6631.5973	28.00	3.98
Ireland	Europe	1967	71.08000	2900100	7655.5690	21.90	3.86
Ireland	Europe	1972	71.28000	3024400	9530.7729	18.30	3.79
Ireland	Europe	1977	72.03000	3271900	11150.9811	15.20	3.34
Ireland	Europe	1982	73.10000	3480000	12618.3214	10.40	2.79
Ireland	Europe	1987	74.36000	3539900	13872.8665	8.40	2.23
Ireland	Europe	1992	75.46700	3557761	17558.8155	6.80	1.92
Ireland	Europe	1997	76.12200	3667233	24521.9471	6.10	1.92
Ireland	Europe	2002	77.78300	3879155	34077.0494	5.40	1.97
Ireland	Europe	2007	78.88500	4109086	40675.9964	3.90	2.00
Israel	Asia	1952	65.39000	1620914	4086.5221	NA	NA
Israel	Asia	1957	67.84000	1944401	5385.2785	NA	NA
Israel	Asia	1962	69.39000	2310904	7105.6307	NA	3.83
Israel	Asia	1967	70.75000	2693585	8393.7414	NA	3.80
Israel	Asia	1972	71.63000	3095893	12786.9322	NA	3.80
Israel	Asia	1977	73.06000	3495918	13306.6192	18.60	3.51
Israel	Asia	1982	74.45000	3858421	15367.0292	14.00	3.17
Israel	Asia	1987	75.60000	4203148	17122.4799	11.00	3.06
Israel	Asia	1992	76.93000	4936550	18051.5225	8.70	2.95
Israel	Asia	1997	78.26900	5531387	20896.6092	6.40	2.93
Israel	Asia	2002	79.69600	6029529	21905.5951	5.20	2.91
Israel	Asia	2007	80.74500	6426679	25523.2771	4.10	2.91
Italy	Europe	1952	65.94000	47666000	4931.4042	NA	NA
Italy	Europe	1957	67.81000	49182000	6248.6562	NA	NA
Italy	Europe	1962	69.24000	50843200	8243.5823	41.00	2.44
Italy	Europe	1967	71.06000	52667100	10022.4013	33.10	2.52
Italy	Europe	1972	72.19000	54365564	12269.2738	26.50	2.38
Italy	Europe	1977	73.48000	56059245	14255.9847	17.30	1.99
Italy	Europe	1982	74.98000	56535636	16537.4835	12.60	1.57
Italy	Europe	1987	76.42000	56729703	19207.2348	9.40	1.35
Italy	Europe	1992	77.44000	56840847	22013.6449	7.70	1.28
Italy	Europe	1997	78.82000	57479469	24675.0245	5.60	1.22
Italy	Europe	2002	80.24000	57926999	27968.0982	4.30	1.25
Italy	Europe	2007	80.54600	58147733	28569.7197	3.60	1.37
Jamaica	Americas	1952	58.53000	1426095	2898.5309	NA	NA
Jamaica	Americas	1957	62.61000	1535090	4756.5258	NA	NA
Jamaica	Americas	1962	65.61000	1665128	5246.1075	57.70	5.63
Jamaica	Americas	1967	67.51000	1861096	6124.7035	49.30	5.79
Jamaica	Americas	1972	69.00000	1997616	7433.8893	41.80	5.11
Jamaica	Americas	1977	70.11000	2156814	6650.1956	35.60	4.12
Jamaica	Americas	1982	71.21000	2298309	6068.0513	31.30	3.56
Jamaica	Americas	1987	71.77000	2326606	6351.2375	27.50	3.14
Jamaica	Americas	1992	71.76600	2378618	7404.9237	24.00	2.86
Jamaica	Americas	1997	72.26200	2531311	7121.9247	20.50	2.68
Jamaica	Americas	2002	72.04700	2664659	6994.7749	17.80	2.55
Jamaica	Americas	2007	72.56700	2780132	7320.8803	16.50	2.41
Japan	Asia	1952	63.03000	86459025	3216.9563	NA	NA
Japan	Asia	1957	65.50000	91563009	4317.6944	NA	NA
Japan	Asia	1962	68.73000	95831757	6576.6495	25.50	1.97
Japan	Asia	1967	71.43000	100825279	9847.7886	16.30	2.02
Japan	Asia	1972	73.42000	107188273	14778.7864	11.90	2.11
Japan	Asia	1977	75.38000	113872473	16610.3770	8.80	1.89
Japan	Asia	1982	77.11000	118454974	19384.1057	6.50	1.75
Japan	Asia	1987	78.67000	122091325	22375.9419	5.00	1.67
Japan	Asia	1992	79.36000	124329269	26824.8951	4.40	1.50
Japan	Asia	1997	80.69000	125956499	28816.5850	3.80	1.37
Japan	Asia	2002	82.00000	127065841	28604.5919	3.00	1.30
Japan	Asia	2007	82.60300	127467972	31656.0681	2.60	1.33
Jordan	Asia	1952	43.15800	607914	1546.9078	NA	NA
Jordan	Asia	1957	45.66900	746559	1886.0806	NA	NA
Jordan	Asia	1962	48.12600	933559	2348.0092	96.60	7.90
Jordan	Asia	1967	51.62900	1255058	2741.7963	75.20	8.03
Jordan	Asia	1972	56.52800	1613551	2110.8563	60.20	7.82
Jordan	Asia	1977	61.13400	1937652	2852.3516	49.10	7.46
Jordan	Asia	1982	63.73900	2347031	4161.4160	40.20	7.07
Jordan	Asia	1987	65.86900	2820042	4448.6799	33.10	6.16
Jordan	Asia	1992	68.01500	3867409	3431.5936	28.30	5.17
Jordan	Asia	1997	69.77200	4526235	3645.3796	24.90	4.40
Jordan	Asia	2002	71.26300	5307470	3844.9172	22.10	3.89
Jordan	Asia	2007	72.53500	6053193	4519.4612	19.30	3.64
Kenya	Africa	1952	42.27000	6464046	853.5409	NA	NA
Kenya	Africa	1957	44.68600	7454779	944.4383	NA	NA
Kenya	Africa	1962	47.94900	8678557	896.9664	109.90	8.04
Kenya	Africa	1967	50.65400	10191512	1056.7365	97.10	8.13
Kenya	Africa	1972	53.55900	12044785	1222.3600	87.30	8.01
Kenya	Africa	1977	56.15500	14500404	1267.6132	76.00	7.70
Kenya	Africa	1982	58.76600	17661452	1348.2258	65.80	7.27
Kenya	Africa	1987	59.33900	21198082	1361.9369	62.70	6.60
Kenya	Africa	1992	59.28500	25020539	1341.9217	68.90	5.67
Kenya	Africa	1997	54.40700	28263827	1360.4850	71.10	5.10
Kenya	Africa	2002	50.99200	31386842	1287.5147	62.20	4.99
Kenya	Africa	2007	54.11000	35610177	1463.2493	49.50	4.82
Korea, Dem. Rep.	Asia	1952	50.05600	8865488	1088.2778	NA	NA
Korea, Dem. Rep.	Asia	1957	54.08100	9411381	1571.1347	NA	NA
Korea, Dem. Rep.	Asia	1962	56.65600	10917494	1621.6936	NA	NA
Korea, Dem. Rep.	Asia	1967	59.94200	12617009	2143.5406	NA	NA
Korea, Dem. Rep.	Asia	1972	63.98300	14781241	3701.6215	NA	NA
Korea, Dem. Rep.	Asia	1977	67.15900	16325320	4106.3012	NA	NA
Korea, Dem. Rep.	Asia	1982	69.10000	17647518	4106.5253	NA	NA
Korea, Dem. Rep.	Asia	1987	70.64700	19067554	4106.4923	NA	NA
Korea, Dem. Rep.	Asia	1992	69.97800	20711375	3726.0635	NA	NA
Korea, Dem. Rep.	Asia	1997	67.72700	21585105	1690.7568	NA	NA
Korea, Dem. Rep.	Asia	2002	66.66200	22215365	1646.7582	NA	NA
Korea, Dem. Rep.	Asia	2007	67.29700	23301725	1593.0655	NA	NA
Korea, Rep.	Asia	1952	47.45300	20947571	1030.5922	NA	NA
Korea, Rep.	Asia	1957	52.68100	22611552	1487.5935	NA	NA
Korea, Rep.	Asia	1962	55.29200	26420307	1536.3444	NA	NA
Korea, Rep.	Asia	1967	57.71600	30131000	2029.2281	NA	NA
Korea, Rep.	Asia	1972	62.61200	33505000	3030.8767	NA	NA
Korea, Rep.	Asia	1977	64.76600	36436000	4657.2210	NA	NA
Korea, Rep.	Asia	1982	67.12300	39326000	5622.9425	NA	NA
Korea, Rep.	Asia	1987	69.81000	41622000	8533.0888	NA	NA
Korea, Rep.	Asia	1992	72.24400	43805450	12104.2787	NA	NA
Korea, Rep.	Asia	1997	74.64700	46173816	15993.5280	NA	NA
Korea, Rep.	Asia	2002	77.04500	47969150	19233.9882	NA	NA
Korea, Rep.	Asia	2007	78.62300	49044790	23348.1397	NA	NA
Kuwait	Asia	1952	55.56500	160000	108382.3529	NA	NA
Kuwait	Asia	1957	58.03300	212846	113523.1329	NA	NA
Kuwait	Asia	1962	60.47000	358266	95458.1118	89.00	7.31
Kuwait	Asia	1967	64.62400	575003	80894.8833	63.70	7.41
Kuwait	Asia	1972	67.71200	841934	109347.8670	47.90	6.98
Kuwait	Asia	1977	69.34300	1140357	59265.4771	36.00	6.05
Kuwait	Asia	1982	71.30900	1497494	31354.0357	25.20	5.08
Kuwait	Asia	1987	74.17400	1891487	28118.4300	17.60	3.31
Kuwait	Asia	1992	75.19000	1418095	34932.9196	14.00	2.14
Kuwait	Asia	1997	76.15600	1765345	40300.6200	11.90	2.79
Kuwait	Asia	2002	76.90400	2111561	35110.1057	10.60	2.72
Kuwait	Asia	2007	77.58800	2505559	47306.9898	9.80	2.67
Lebanon	Asia	1952	55.92800	1439529	4834.8041	NA	NA
Lebanon	Asia	1957	59.48900	1647412	6089.7869	NA	NA
Lebanon	Asia	1962	62.09400	1886848	5714.5606	54.70	5.69
Lebanon	Asia	1967	63.87000	2186894	6006.9830	49.80	5.30
Lebanon	Asia	1972	65.42100	2680018	7486.3843	47.20	4.73
Lebanon	Asia	1977	66.09900	3115787	8659.6968	43.60	4.27
Lebanon	Asia	1982	66.98300	3086876	7640.5195	37.80	3.80
Lebanon	Asia	1987	67.92600	3089353	5377.0913	30.80	3.28
Lebanon	Asia	1992	69.29200	3219994	6890.8069	24.70	2.84
Lebanon	Asia	1997	70.26500	3430388	8754.9639	19.90	2.47
Lebanon	Asia	2002	71.02800	3677780	9313.9388	15.10	2.04
Lebanon	Asia	2007	71.99300	3921278	10461.0587	10.40	1.62
Lesotho	Africa	1952	42.13800	748747	298.8462	NA	NA
Lesotho	Africa	1957	45.04700	813338	335.9971	NA	NA
Lesotho	Africa	1962	47.74700	893143	411.8006	141.70	5.82
Lesotho	Africa	1967	48.49200	996380	498.6390	138.90	5.80
Lesotho	Africa	1972	49.76700	1116779	496.5816	125.40	5.80
Lesotho	Africa	1977	52.20800	1251524	745.3695	106.20	5.71
Lesotho	Africa	1982	55.07800	1411807	797.2631	85.80	5.49
Lesotho	Africa	1987	57.18000	1599200	773.9932	73.70	5.17
Lesotho	Africa	1992	59.68500	1803195	977.4863	71.10	4.76
Lesotho	Africa	1997	55.55800	1982823	1186.1480	80.50	4.39
Lesotho	Africa	2002	44.59300	2046772	1275.1846	86.30	3.86
Lesotho	Africa	2007	42.59200	2012649	1569.3314	84.30	3.41
Liberia	Africa	1952	38.48000	863308	575.5730	NA	NA
Liberia	Africa	1957	39.48600	975950	620.9700	NA	NA
Liberia	Africa	1962	40.50200	1112796	634.1952	211.40	6.45
Liberia	Africa	1967	41.53600	1279406	713.6036	201.70	6.58
Liberia	Africa	1972	42.61400	1482628	803.0055	184.40	6.78
Liberia	Africa	1977	43.76400	1703617	640.3224	168.30	6.93
Liberia	Africa	1982	44.85200	1956875	572.1996	157.10	6.96
Liberia	Africa	1987	46.02700	2269414	506.1139	161.50	6.75
Liberia	Africa	1992	40.80200	1912974	636.6229	170.30	6.34
Liberia	Africa	1997	42.22100	2200725	609.1740	145.20	6.06
Liberia	Africa	2002	43.75300	2814651	531.4824	108.20	5.72
Liberia	Africa	2007	45.67800	3193942	414.5073	76.90	5.28
Libya	Africa	1952	42.72300	1019729	2387.5481	NA	NA
Libya	Africa	1957	45.28900	1201578	3448.2844	NA	NA
Libya	Africa	1962	47.80800	1441863	6757.0308	148.40	7.61
Libya	Africa	1967	50.22700	1759224	18772.7517	113.30	7.78
Libya	Africa	1972	52.77300	2183877	21011.4972	86.00	7.93
Libya	Africa	1977	57.44200	2721783	21951.2118	65.60	7.98
Libya	Africa	1982	62.15500	3344074	17364.2754	52.20	7.42
Libya	Africa	1987	66.23400	3799845	11770.5898	41.30	5.91
Libya	Africa	1992	68.75500	4364501	9640.1385	32.20	4.43
Libya	Africa	1997	71.55500	4759670	9467.4461	26.50	3.38
Libya	Africa	2002	72.73700	5368585	9534.6775	22.70	2.93
Libya	Africa	2007	73.95200	6036914	12057.4993	17.30	2.69
Madagascar	Africa	1952	36.68100	4762912	1443.0117	NA	NA
Madagascar	Africa	1957	38.86500	5181679	1589.2027	NA	NA
Madagascar	Africa	1962	40.84800	5703324	1643.3871	NA	7.30
Madagascar	Africa	1967	42.88100	6334556	1634.0473	105.40	7.31
Madagascar	Africa	1972	44.85100	7082430	1748.5630	95.30	7.32
Madagascar	Africa	1977	46.88100	8007166	1544.2286	101.90	7.01
Madagascar	Africa	1982	48.96900	9171477	1302.8787	108.50	6.24
Madagascar	Africa	1987	49.35000	10568642	1155.4419	106.40	6.23
Madagascar	Africa	1992	52.21400	12210395	1040.6762	92.90	6.18
Madagascar	Africa	1997	54.97800	14165114	986.2959	80.00	5.84
Madagascar	Africa	2002	57.28600	16473477	894.6371	62.90	5.34
Madagascar	Africa	2007	59.44300	19167654	1044.7701	47.90	4.87
Malawi	Africa	1952	36.25600	2917802	369.1651	NA	NA
Malawi	Africa	1957	37.20700	3221238	416.3698	NA	NA
Malawi	Africa	1962	38.41000	3628608	427.9011	214.60	6.98
Malawi	Africa	1967	39.48700	4147252	495.5148	211.50	7.18
Malawi	Africa	1972	41.76600	4730997	584.6220	200.60	7.39
Malawi	Africa	1977	43.76700	5637246	663.2237	170.60	7.58
Malawi	Africa	1982	45.64200	6502825	632.8039	144.40	7.61
Malawi	Africa	1987	47.45700	7824747	635.5174	149.60	7.40
Malawi	Africa	1992	49.42000	10014249	563.2000	133.10	6.72
Malawi	Africa	1997	47.49500	10419991	692.2758	117.10	6.41
Malawi	Africa	2002	45.00900	11824495	665.4231	88.80	6.12
Malawi	Africa	2007	48.30300	13327079	759.3499	64.50	5.84
Malaysia	Asia	1952	48.46300	6748378	1831.1329	NA	NA
Malaysia	Asia	1957	52.10200	7739235	1810.0670	NA	NA
Malaysia	Asia	1962	55.73700	8906385	2036.8849	61.10	6.05
Malaysia	Asia	1967	59.37100	10154878	2277.7424	49.10	5.33
Malaysia	Asia	1972	63.01000	11441462	2849.0948	39.80	4.60
Malaysia	Asia	1977	65.25600	12845381	3827.9216	30.50	3.99
Malaysia	Asia	1982	68.00000	14441916	4920.3560	22.40	3.73
Malaysia	Asia	1987	69.50000	16331785	5249.8027	16.60	3.60
Malaysia	Asia	1992	70.69300	18319502	7277.9128	13.00	3.45
Malaysia	Asia	1997	71.93800	20476091	10132.9096	10.70	3.19
Malaysia	Asia	2002	73.04400	22662365	10206.9779	7.60	2.54
Malaysia	Asia	2007	74.24100	24821286	12451.6558	6.90	2.09
Mali	Africa	1952	33.68500	3838168	452.3370	NA	NA
Mali	Africa	1957	35.30700	4241884	490.3822	NA	NA
Mali	Africa	1962	36.93600	4690372	496.1743	225.20	6.75
Mali	Africa	1967	38.48700	5212416	545.0099	203.00	6.86
Mali	Africa	1972	39.97700	5828158	581.3689	191.10	6.92
Mali	Africa	1977	41.71400	6491649	686.3953	172.80	7.00
Mali	Africa	1982	43.91600	6998256	618.0141	154.20	7.07
Mali	Africa	1987	46.36400	7634008	684.1716	137.80	7.09
Mali	Africa	1992	48.38800	8416215	739.0144	127.30	7.02
Mali	Africa	1997	49.90300	9384984	790.2580	122.60	6.90
Mali	Africa	2002	51.81800	10580176	951.4098	108.80	6.81
Mali	Africa	2007	54.46700	12031795	1042.5816	90.10	6.81
Mauritania	Africa	1952	40.54300	1022556	743.1159	NA	NA
Mauritania	Africa	1957	42.33800	1076852	846.1203	NA	NA
Mauritania	Africa	1962	44.24800	1146757	1055.8960	128.90	6.79
Mauritania	Africa	1967	46.28900	1230542	1421.1452	114.80	6.80
Mauritania	Africa	1972	48.43700	1332786	1586.8518	107.00	6.76
Mauritania	Africa	1977	50.85200	1456688	1497.4922	102.00	6.59
Mauritania	Africa	1982	53.59900	1622136	1481.1502	92.50	6.31
Mauritania	Africa	1987	56.14500	1841240	1421.6036	82.10	6.10
Mauritania	Africa	1992	58.33300	2119465	1361.3698	76.70	5.88
Mauritania	Africa	1997	60.43000	2444741	1483.1361	76.30	5.57
Mauritania	Africa	2002	62.24700	2828858	1579.0195	75.90	5.26
Mauritania	Africa	2007	64.16400	3270065	1803.1515	73.10	4.99
Mauritius	Africa	1952	50.98600	516556	1967.9557	NA	NA
Mauritius	Africa	1957	58.08900	609816	2034.0380	NA	NA
Mauritius	Africa	1962	60.24600	701016	2529.0675	63.60	6.12
Mauritius	Africa	1967	61.55700	789309	2475.3876	68.40	4.85
Mauritius	Africa	1972	62.94400	851334	2575.4842	58.70	3.58
Mauritius	Africa	1977	64.93000	913025	3710.9830	39.50	3.07
Mauritius	Africa	1982	66.71100	992040	3688.0377	28.30	2.41
Mauritius	Africa	1987	68.74000	1042663	4783.5869	24.40	2.27
Mauritius	Africa	1992	69.74500	1096202	6058.2538	18.40	2.25
Mauritius	Africa	1997	70.73600	1149818	7425.7053	19.80	2.07
Mauritius	Africa	2002	71.95400	1200206	9021.8159	14.20	1.93
Mauritius	Africa	2007	72.80100	1250882	10956.9911	14.10	1.63
Mexico	Americas	1952	50.78900	30144317	3478.1255	NA	NA
Mexico	Americas	1957	55.19000	35015548	4131.5466	NA	NA
Mexico	Americas	1962	58.29900	41121485	4581.6094	94.90	6.77
Mexico	Americas	1967	60.11000	47995559	5754.7339	84.10	6.78
Mexico	Americas	1972	62.36100	55984294	6809.4067	72.70	6.53
Mexico	Americas	1977	65.03200	63759976	7674.9291	62.80	5.42
Mexico	Americas	1982	67.40500	71640904	9611.1475	51.40	4.33
Mexico	Americas	1987	69.49800	80122492	8688.1560	42.10	3.67
Mexico	Americas	1992	71.45500	88111030	9472.3843	33.70	3.20
Mexico	Americas	1997	73.67000	95895146	9767.2975	25.80	2.83
Mexico	Americas	2002	74.90200	102479927	10742.4405	19.30	2.57
Mexico	Americas	2007	76.19500	108700891	11977.5750	15.80	2.38
Mongolia	Asia	1952	42.24400	800663	786.5669	NA	NA
Mongolia	Asia	1957	45.24800	882134	912.6626	NA	NA
Mongolia	Asia	1962	48.25100	1010280	1056.3540	NA	7.35
Mongolia	Asia	1967	51.25300	1149500	1226.0411	NA	7.59
Mongolia	Asia	1972	53.75400	1320500	1421.7420	NA	7.50
Mongolia	Asia	1977	55.49100	1528000	1647.5117	NA	6.78
Mongolia	Asia	1982	57.48900	1756032	2000.6031	105.60	5.86
Mongolia	Asia	1987	60.22200	2015133	2338.0083	87.30	4.91
Mongolia	Asia	1992	61.27100	2312802	1785.4020	70.70	3.45
Mongolia	Asia	1997	63.62500	2494803	1902.2521	56.60	2.43
Mongolia	Asia	2002	65.03300	2674234	2140.7393	42.50	2.09
Mongolia	Asia	2007	66.80300	2874127	3095.7723	30.60	2.32
Montenegro	Europe	1952	59.16400	413834	2647.5856	NA	NA
Montenegro	Europe	1957	61.44800	442829	3682.2599	NA	NA
Montenegro	Europe	1962	63.72800	474528	4649.5938	NA	3.31
Montenegro	Europe	1967	67.17800	501035	5907.8509	NA	2.83
Montenegro	Europe	1972	70.63600	527678	7778.4140	NA	2.63
Montenegro	Europe	1977	73.06600	560073	9595.9299	NA	2.40
Montenegro	Europe	1982	74.10100	562548	11222.5876	NA	2.19
Montenegro	Europe	1987	74.86500	569473	11732.5102	18.20	1.98
Montenegro	Europe	1992	75.43500	621621	7003.3390	14.00	1.83
Montenegro	Europe	1997	75.44500	692651	6465.6133	13.50	1.82
Montenegro	Europe	2002	73.98100	720230	6557.1943	11.50	1.79
Montenegro	Europe	2007	74.54300	684736	9253.8961	8.20	1.73
Morocco	Africa	1952	42.87300	9939217	1688.2036	NA	NA
Morocco	Africa	1957	45.42300	11406350	1642.0023	NA	NA
Morocco	Africa	1962	47.92400	13056604	1566.3535	140.40	7.13
Morocco	Africa	1967	50.33500	14770296	1711.0448	127.90	6.95
Morocco	Africa	1972	52.86200	16660670	1930.1950	116.80	6.49
Morocco	Africa	1977	55.73000	18396941	2370.6200	104.00	5.97
Morocco	Africa	1982	59.65000	20198730	2702.6204	87.30	5.44
Morocco	Africa	1987	62.67700	22987397	2755.0470	71.00	4.57
Morocco	Africa	1992	65.39300	25798239	2948.0473	58.50	3.76
Morocco	Africa	1997	67.66000	28529501	2982.1019	47.70	3.03
Morocco	Africa	2002	69.61500	31167783	3258.4956	38.90	2.54
Morocco	Africa	2007	71.16400	33757175	3820.1752	31.90	2.40
Mozambique	Africa	1952	31.28600	6446316	468.5260	NA	NA
Mozambique	Africa	1957	33.77900	7038035	495.5868	NA	NA
Mozambique	Africa	1962	36.16100	7788944	556.6864	NA	6.60
Mozambique	Africa	1967	38.11300	8680909	566.6692	184.10	6.60
Mozambique	Africa	1972	40.32800	9809596	724.9178	180.50	6.58
Mozambique	Africa	1977	42.49500	11127868	502.3197	176.40	6.53
Mozambique	Africa	1982	42.79500	12587223	462.2114	173.30	6.46
Mozambique	Africa	1987	42.86100	12891952	389.8762	165.70	6.35
Mozambique	Africa	1992	44.28400	13160731	410.8968	154.70	6.14
Mozambique	Africa	1997	46.34400	16603334	472.3461	132.70	5.88
Mozambique	Africa	2002	44.02600	18473780	633.6179	104.00	5.74
Mozambique	Africa	2007	42.08200	19951656	823.6856	81.50	5.59
Myanmar	Asia	1952	36.31900	20092996	331.0000	NA	NA
Myanmar	Asia	1957	41.90500	21731844	350.0000	NA	NA
Myanmar	Asia	1962	45.10800	23634436	388.0000	NA	NA
Myanmar	Asia	1967	49.37900	25870271	349.0000	NA	NA
Myanmar	Asia	1972	53.07000	28466390	357.0000	NA	NA
Myanmar	Asia	1977	56.05900	31528087	371.0000	NA	NA
Myanmar	Asia	1982	58.05600	34680442	424.0000	NA	NA
Myanmar	Asia	1987	58.33900	38028578	385.0000	NA	NA
Myanmar	Asia	1992	59.32000	40546538	347.0000	NA	NA
Myanmar	Asia	1997	60.32800	43247867	415.0000	NA	NA
Myanmar	Asia	2002	59.90800	45598081	611.0000	NA	NA
Myanmar	Asia	2007	62.06900	47761980	944.0000	NA	NA
Namibia	Africa	1952	41.72500	485831	2423.7804	NA	NA
Namibia	Africa	1957	45.22600	548080	2621.4481	NA	NA
Namibia	Africa	1962	48.38600	621392	3173.2156	NA	6.18
Namibia	Africa	1967	51.15900	706640	3793.6948	62.30	6.30
Namibia	Africa	1972	53.86700	821782	3746.0809	62.90	6.57
Namibia	Africa	1977	56.43700	977026	3876.4860	63.70	6.62
Namibia	Africa	1982	58.96800	1099010	4191.1005	61.50	6.26
Namibia	Africa	1987	60.83500	1278184	3693.7313	53.80	5.63
Namibia	Africa	1992	61.99900	1554253	3804.5380	47.80	4.97
Namibia	Africa	1997	58.90900	1774766	3899.5243	48.40	4.35
Namibia	Africa	2002	51.47900	1972153	4072.3248	48.70	3.85
Namibia	Africa	2007	52.90600	2055080	4811.0604	42.70	3.44
Nepal	Asia	1952	36.15700	9182536	545.8657	NA	NA
Nepal	Asia	1957	37.68600	9682338	597.9364	NA	NA
Nepal	Asia	1962	39.39300	10332057	652.3969	213.30	6.00
Nepal	Asia	1967	41.47200	11261690	676.4422	191.30	5.99
Nepal	Asia	1972	43.97100	12412593	674.7881	170.90	5.95
Nepal	Asia	1977	46.74800	13933198	694.1124	152.30	5.85
Nepal	Asia	1982	49.59400	15796314	718.3731	132.10	5.68
Nepal	Asia	1987	52.53700	17917180	775.6325	111.10	5.38
Nepal	Asia	1992	55.72700	20326209	897.7404	88.90	5.00
Nepal	Asia	1997	59.42600	23001113	1010.8921	69.60	4.47
Nepal	Asia	2002	61.34000	25873917	1057.2063	53.80	3.78
Nepal	Asia	2007	63.78500	28901790	1091.3598	42.00	3.05
Netherlands	Europe	1952	72.13000	10381988	8941.5719	NA	NA
Netherlands	Europe	1957	72.99000	11026383	11276.1934	NA	NA
Netherlands	Europe	1962	73.23000	11805689	12790.8496	15.60	3.18
Netherlands	Europe	1967	73.82000	12596822	15363.2514	13.80	2.81
Netherlands	Europe	1972	73.75000	13329874	18794.7457	11.70	2.15
Netherlands	Europe	1977	75.24000	13852989	21209.0592	9.70	1.58
Netherlands	Europe	1982	76.05000	14310401	21399.4605	8.40	1.50
Netherlands	Europe	1987	76.83000	14665278	23651.3236	7.50	1.56
Netherlands	Europe	1992	77.42000	15174244	26790.9496	6.30	1.59
Netherlands	Europe	1997	78.03000	15604464	30246.1306	5.30	1.56
Netherlands	Europe	2002	78.53000	16122830	33724.7578	4.90	1.73
Netherlands	Europe	2007	79.76200	16570613	36797.9333	4.20	1.72
New Zealand	Oceania	1952	69.39000	1994794	10556.5757	NA	NA
New Zealand	Oceania	1957	70.26000	2229407	12247.3953	NA	NA
New Zealand	Oceania	1962	71.24000	2488550	13175.6780	20.90	3.51
New Zealand	Oceania	1967	71.52000	2728150	14463.9189	17.90	3.00
New Zealand	Oceania	1972	71.89000	2929100	16046.0373	16.20	2.90
New Zealand	Oceania	1977	72.22000	3164900	16233.7177	13.90	2.32
New Zealand	Oceania	1982	73.84000	3210650	17632.4104	12.10	2.10
New Zealand	Oceania	1987	74.32000	3317166	19007.1913	10.60	2.24
New Zealand	Oceania	1992	76.33000	3437674	18363.3249	8.20	2.31
New Zealand	Oceania	1997	77.55000	3676187	21050.4138	6.60	2.05
New Zealand	Oceania	2002	79.11000	3908037	23189.8014	5.80	1.95
New Zealand	Oceania	2007	80.20400	4115771	25185.0091	5.30	2.11
Nicaragua	Americas	1952	42.31400	1165790	3112.3639	NA	NA
Nicaragua	Americas	1957	45.43200	1358828	3457.4159	NA	NA
Nicaragua	Americas	1962	48.63200	1590597	3634.3644	131.10	7.18
Nicaragua	Americas	1967	51.88400	1865490	4643.3935	123.10	6.96
Nicaragua	Americas	1972	55.15100	2182908	4688.5933	111.20	6.81
Nicaragua	Americas	1977	57.47000	2554598	5486.3711	91.30	6.42
Nicaragua	Americas	1982	59.29800	2979423	3470.3382	69.90	5.89
Nicaragua	Americas	1987	62.00800	3344353	2955.9844	56.50	5.12
Nicaragua	Americas	1992	65.84300	4017939	2170.1517	47.10	4.52
Nicaragua	Americas	1997	68.42600	4609572	2253.0230	37.60	3.70
Nicaragua	Americas	2002	70.83600	5146848	2474.5488	29.80	3.05
Nicaragua	Americas	2007	72.89900	5675356	2749.3210	24.40	2.76
Niger	Africa	1952	37.44400	3379468	761.8794	NA	NA
Niger	Africa	1957	38.59800	3692184	835.5234	NA	NA
Niger	Africa	1962	39.48700	4076008	997.7661	NA	7.12
Niger	Africa	1967	40.11800	4534062	1054.3849	133.10	7.30
Niger	Africa	1972	40.54600	5060262	954.2092	140.40	7.50
Niger	Africa	1977	41.29100	5682086	808.8971	138.90	7.63
Niger	Africa	1982	42.59800	6437188	909.7221	135.30	7.75
Niger	Africa	1987	44.55500	7332638	668.3000	141.40	7.77
Niger	Africa	1992	47.39100	8392818	581.1827	132.60	7.77
Niger	Africa	1997	51.31300	9666252	580.3052	111.30	7.77
Niger	Africa	2002	54.49600	11140655	601.0745	94.10	7.68
Niger	Africa	2007	56.86700	12894865	619.6769	75.20	7.59
Nigeria	Africa	1952	36.32400	33119096	1077.2819	NA	NA
Nigeria	Africa	1957	37.80200	37173340	1100.5926	NA	NA
Nigeria	Africa	1962	39.36000	41871351	1150.9275	182.60	6.35
Nigeria	Africa	1967	41.04000	47287752	1014.5141	182.60	6.36
Nigeria	Africa	1972	42.82100	53740085	1698.3888	159.20	6.58
Nigeria	Africa	1977	44.51400	62209173	1981.9518	135.80	6.76
Nigeria	Africa	1982	45.82600	73039376	1576.9738	124.40	6.77
Nigeria	Africa	1987	46.88600	81551520	1385.0296	125.40	6.63
Nigeria	Africa	1992	47.47200	93364244	1619.8482	125.50	6.40
Nigeria	Africa	1997	47.46400	106207839	1624.9413	119.90	6.19
Nigeria	Africa	2002	46.60800	119901274	1615.2864	105.90	6.06
Nigeria	Africa	2007	46.85900	135031164	2013.9773	90.30	6.02
Norway	Europe	1952	72.67000	3327728	10095.4217	NA	NA
Norway	Europe	1957	73.44000	3491938	11653.9730	NA	NA
Norway	Europe	1962	73.47000	3638919	13450.4015	17.50	2.89
Norway	Europe	1967	74.08000	3786019	16361.8765	14.80	2.80
Norway	Europe	1972	74.34000	3933004	18965.0555	12.20	2.38
Norway	Europe	1977	75.37000	4043205	23311.3494	9.30	1.75
Norway	Europe	1982	75.97000	4114787	26298.6353	8.00	1.71
Norway	Europe	1987	75.89000	4186147	31540.9748	8.20	1.75
Norway	Europe	1992	77.32000	4286357	33965.6611	5.80	1.88
Norway	Europe	1997	78.32000	4405672	41283.1643	4.20	1.86
Norway	Europe	2002	79.05000	4535591	44683.9753	3.60	1.75
Norway	Europe	2007	80.19600	4627926	49357.1902	3.00	1.90
Oman	Asia	1952	37.57800	507833	1828.2303	NA	NA
Oman	Asia	1957	40.08000	561977	2242.7466	NA	NA
Oman	Asia	1962	43.16500	628164	2924.6381	226.00	7.25
Oman	Asia	1967	46.98800	714775	4720.9427	178.50	7.28
Oman	Asia	1972	52.14300	829050	10618.0385	136.10	7.41
Oman	Asia	1977	57.36700	1004533	11848.3439	100.10	8.02
Oman	Asia	1982	62.72800	1301048	12954.7910	66.60	8.35
Oman	Asia	1987	67.73400	1593882	18115.2231	41.80	7.93
Oman	Asia	1992	71.19700	1915208	18616.7069	26.80	6.47
Oman	Asia	1997	72.49900	2283635	19702.0558	17.70	4.63
Oman	Asia	2002	74.19300	2713462	19774.8369	12.50	3.30
Oman	Asia	2007	75.64000	3204897	22316.1929	10.40	2.89
Pakistan	Asia	1952	43.43600	41346560	684.5971	NA	NA
Pakistan	Asia	1957	45.55700	46679944	747.0835	NA	NA
Pakistan	Asia	1962	47.67000	53100671	803.3427	178.00	6.60
Pakistan	Asia	1967	49.80000	60641899	942.4083	151.50	6.60
Pakistan	Asia	1972	51.92900	69325921	1049.9390	135.70	6.61
Pakistan	Asia	1977	54.04300	78152686	1175.9212	126.10	6.60
Pakistan	Asia	1982	56.15800	91462088	1443.4298	119.40	6.48
Pakistan	Asia	1987	58.24500	105186881	1704.6866	111.40	6.31
Pakistan	Asia	1992	60.83800	120065004	1971.8295	102.50	5.77
Pakistan	Asia	1997	61.81800	135564834	2049.3505	93.30	5.04
Pakistan	Asia	2002	63.61000	153403524	2092.7124	84.40	4.13
Pakistan	Asia	2007	65.48300	169270617	2605.9476	77.40	3.65
Panama	Americas	1952	55.19100	940080	2480.3803	NA	NA
Panama	Americas	1957	59.20100	1063506	2961.8009	NA	NA
Panama	Americas	1962	61.81700	1215725	3536.5403	63.60	5.81
Panama	Americas	1967	64.07100	1405486	4421.0091	56.20	5.47
Panama	Americas	1972	66.21600	1616384	5364.2497	47.40	4.94
Panama	Americas	1977	68.68100	1839782	5351.9121	39.00	4.26
Panama	Americas	1982	70.47200	2036305	7009.6016	33.40	3.67
Panama	Americas	1987	71.52300	2253639	7034.7792	28.10	3.26
Panama	Americas	1992	72.46200	2484997	6618.7431	24.60	2.98
Panama	Americas	1997	73.73800	2734531	7113.6923	23.00	2.87
Panama	Americas	2002	74.71200	2990875	7356.0319	20.90	2.78
Panama	Americas	2007	75.53700	3242173	9809.1856	18.50	2.64
Paraguay	Americas	1952	62.64900	1555876	1952.3087	NA	NA
Paraguay	Americas	1957	63.19600	1770902	2046.1547	NA	NA
Paraguay	Americas	1962	64.36100	2009813	2148.0271	61.40	6.47
Paraguay	Americas	1967	64.95100	2287985	2299.3763	59.30	6.17
Paraguay	Americas	1972	65.81500	2614104	2523.3380	56.80	5.46
Paraguay	Americas	1977	66.35300	2984494	3248.3733	52.60	5.20
Paraguay	Americas	1982	66.87400	3366439	4258.5036	47.00	5.19
Paraguay	Americas	1987	67.37800	3886512	3998.8757	40.70	4.84
Paraguay	Americas	1992	68.22500	4483945	4196.4111	34.80	4.36
Paraguay	Americas	1997	69.40000	5154123	4247.4003	30.10	3.92
Paraguay	Americas	2002	70.75500	5884491	3783.6742	26.10	3.51
Paraguay	Americas	2007	71.75200	6667147	4172.8385	22.40	3.12
Peru	Americas	1952	43.90200	8025700	3758.5234	NA	NA
Peru	Americas	1957	46.26300	9146100	4245.2567	NA	NA
Peru	Americas	1962	49.09600	10516500	4957.0380	129.10	6.86
Peru	Americas	1967	51.44500	12132200	5788.0933	111.60	6.61
Peru	Americas	1972	55.44800	13954700	5937.8273	98.30	6.07
Peru	Americas	1977	58.44700	15990099	6281.2909	87.00	5.44
Peru	Americas	1982	61.40600	18125129	6434.5018	78.70	4.73
Peru	Americas	1987	64.13400	20195924	6360.9434	64.60	4.14
Peru	Americas	1992	66.45800	22430449	4446.3809	51.00	3.62
Peru	Americas	1997	68.38600	24748122	5838.3477	36.90	3.14
Peru	Americas	2002	69.90600	26769436	5909.0201	25.70	2.82
Peru	Americas	2007	71.42100	28674757	7408.9056	19.00	2.61
Philippines	Asia	1952	47.75200	22438691	1272.8810	NA	NA
Philippines	Asia	1957	51.33400	26072194	1547.9448	NA	NA
Philippines	Asia	1962	54.75700	30325264	1649.5522	64.20	7.02
Philippines	Asia	1967	56.39300	35356600	1814.1274	58.00	6.59
Philippines	Asia	1972	58.06500	40850141	1989.3741	54.70	6.04
Philippines	Asia	1977	60.06000	46850962	2373.2043	54.20	5.51
Philippines	Asia	1982	62.08200	53456774	2603.2738	52.30	4.98
Philippines	Asia	1987	64.15100	60017788	2189.6350	46.70	4.55
Philippines	Asia	1992	66.45800	67185766	2279.3240	37.30	4.18
Philippines	Asia	1997	68.56400	75012988	2536.5349	31.80	3.92
Philippines	Asia	2002	70.30300	82995088	2650.9211	28.90	3.71
Philippines	Asia	2007	71.68800	91077287	3190.4810	26.40	3.33
Poland	Europe	1952	61.31000	25730551	4029.3297	NA	NA
Poland	Europe	1957	65.77000	28235346	4734.2530	NA	NA
Poland	Europe	1962	67.64000	30329617	5338.7521	49.60	2.72
Poland	Europe	1967	69.61000	31785378	6557.1528	35.70	2.30
Poland	Europe	1972	70.85000	33039545	8006.5070	28.80	2.23
Poland	Europe	1977	70.67000	34621254	9508.1415	23.30	2.27
Poland	Europe	1982	71.32000	36227381	8451.5310	20.00	2.32
Poland	Europe	1987	70.98000	37740710	9082.3512	16.60	2.19
Poland	Europe	1992	70.99000	38370697	7738.8812	14.30	1.91
Poland	Europe	1997	72.75000	38654957	10159.5837	10.40	1.52
Poland	Europe	2002	74.67000	38625976	12002.2391	7.30	1.28
Poland	Europe	2007	75.56300	38518241	15389.9247	6.00	1.31
Portugal	Europe	1952	59.82000	8526050	3068.3199	NA	NA
Portugal	Europe	1957	61.51000	8817650	3774.5717	NA	NA
Portugal	Europe	1962	64.39000	9019800	4727.9549	78.70	3.19
Portugal	Europe	1967	66.60000	9103000	6361.5180	61.70	3.13
Portugal	Europe	1972	69.26000	8970450	9022.2474	47.60	2.88
Portugal	Europe	1977	70.41000	9662600	10172.4857	29.50	2.57
Portugal	Europe	1982	72.77000	9859650	11753.8429	19.90	2.07
Portugal	Europe	1987	74.06000	9915289	13039.3088	14.50	1.65
Portugal	Europe	1992	74.86000	9927680	16207.2666	9.70	1.50
Portugal	Europe	1997	75.97000	10156415	17641.0316	6.60	1.48
Portugal	Europe	2002	77.29000	10433867	19970.9079	4.70	1.45
Portugal	Europe	2007	78.09800	10642836	20509.6478	3.30	1.37
Puerto Rico	Americas	1952	64.28000	2227000	3081.9598	NA	NA
Puerto Rico	Americas	1957	68.54000	2260000	3907.1562	NA	NA
Puerto Rico	Americas	1962	69.62000	2448046	5108.3446	NA	4.41
Puerto Rico	Americas	1967	71.10000	2648961	6929.2777	NA	3.53
Puerto Rico	Americas	1972	72.16000	2847132	9123.0417	NA	3.01
Puerto Rico	Americas	1977	73.44000	3080828	9770.5249	NA	2.77
Puerto Rico	Americas	1982	73.75000	3279001	10330.9891	NA	2.49
Puerto Rico	Americas	1987	74.63000	3444468	12281.3419	NA	2.28
Puerto Rico	Americas	1992	73.91100	3585176	14641.5871	NA	2.18
Puerto Rico	Americas	1997	74.91700	3759430	16999.4333	NA	2.01
Puerto Rico	Americas	2002	77.77800	3859606	18855.6062	NA	1.83
Puerto Rico	Americas	2007	78.74600	3942491	19328.7090	NA	1.71
Reunion	Africa	1952	52.72400	257700	2718.8853	NA	NA
Reunion	Africa	1957	55.09000	308700	2769.4518	NA	NA
Reunion	Africa	1962	57.66600	358900	3173.7233	NA	NA
Reunion	Africa	1967	60.54200	414024	4021.1757	NA	NA
Reunion	Africa	1972	64.27400	461633	5047.6586	NA	NA
Reunion	Africa	1977	67.06400	492095	4319.8041	NA	NA
Reunion	Africa	1982	69.88500	517810	5267.2194	NA	NA
Reunion	Africa	1987	71.91300	562035	5303.3775	NA	NA
Reunion	Africa	1992	73.61500	622191	6101.2558	NA	NA
Reunion	Africa	1997	74.77200	684810	6071.9414	NA	NA
Reunion	Africa	2002	75.74400	743981	6316.1652	NA	NA
Reunion	Africa	2007	76.44200	798094	7670.1226	NA	NA
Romania	Europe	1952	61.05000	16630000	3144.6132	NA	NA
Romania	Europe	1957	64.10000	17829327	3943.3702	NA	NA
Romania	Europe	1962	66.80000	18680721	4734.9976	NA	2.02
Romania	Europe	1967	66.80000	19284814	6470.8665	NA	3.65
Romania	Europe	1972	69.21000	20662648	8011.4144	50.10	2.53
Romania	Europe	1977	69.46000	21658597	9356.3972	39.30	2.58
Romania	Europe	1982	69.66000	22356726	9605.3141	32.50	2.16
Romania	Europe	1987	69.53000	22686371	9696.2733	32.60	2.41
Romania	Europe	1992	69.36000	22797027	6598.4099	29.10	1.49
Romania	Europe	1997	69.72000	22562458	7346.5476	26.00	1.30
Romania	Europe	2002	71.32200	22404337	7885.3601	21.60	1.27
Romania	Europe	2007	72.47600	22276056	10808.4756	15.30	1.33
Rwanda	Africa	1952	40.00000	2534927	493.3239	NA	NA
Rwanda	Africa	1957	41.50000	2822082	540.2894	NA	NA
Rwanda	Africa	1962	43.00000	3051242	597.4731	123.40	8.20
Rwanda	Africa	1967	44.10000	3451079	510.9637	124.00	8.20
Rwanda	Africa	1972	44.60000	3992121	590.5807	134.10	8.28
Rwanda	Africa	1977	45.00000	4657072	670.0806	148.00	8.42
Rwanda	Africa	1982	46.21800	5507565	881.5706	111.80	8.42
Rwanda	Africa	1987	44.02000	6349365	847.9912	93.10	8.00
Rwanda	Africa	1992	23.59900	7290203	737.0686	101.30	6.77
Rwanda	Africa	1997	36.08700	7212583	589.9445	121.70	6.16
Rwanda	Africa	2002	43.41300	7852401	785.6538	94.10	5.67
Rwanda	Africa	2007	46.24200	8860588	863.0885	56.80	5.17
Sao Tome and Principe	Africa	1952	46.47100	60011	879.5836	NA	NA
Sao Tome and Principe	Africa	1957	48.94500	61325	860.7369	NA	NA
Sao Tome and Principe	Africa	1962	51.89300	65345	1071.5511	NA	NA
Sao Tome and Principe	Africa	1967	54.42500	70787	1384.8406	NA	NA
Sao Tome and Principe	Africa	1972	56.48000	76595	1532.9853	NA	NA
Sao Tome and Principe	Africa	1977	58.55000	86796	1737.5617	NA	NA
Sao Tome and Principe	Africa	1982	60.35100	98593	1890.2181	NA	NA
Sao Tome and Principe	Africa	1987	61.72800	110812	1516.5255	NA	NA
Sao Tome and Principe	Africa	1992	62.74200	125911	1428.7778	NA	NA
Sao Tome and Principe	Africa	1997	63.30600	145608	1339.0760	NA	NA
Sao Tome and Principe	Africa	2002	64.33700	170372	1353.0924	NA	NA
Sao Tome and Principe	Africa	2007	65.52800	199579	1598.4351	NA	NA
Saudi Arabia	Asia	1952	39.87500	4005677	6459.5548	NA	NA
Saudi Arabia	Asia	1957	42.86800	4419650	8157.5912	NA	NA
Saudi Arabia	Asia	1962	45.91400	4943029	11626.4197	NA	7.24
Saudi Arabia	Asia	1967	49.90100	5618198	16903.0489	NA	7.26
Saudi Arabia	Asia	1972	53.88600	6472756	24837.4287	110.30	7.30
Saudi Arabia	Asia	1977	58.69000	8128505	34167.7626	83.40	7.30
Saudi Arabia	Asia	1982	63.01200	11254672	33693.1753	63.10	7.05
Saudi Arabia	Asia	1987	66.29500	14619745	21198.2614	45.20	6.33
Saudi Arabia	Asia	1992	68.76800	16945857	24841.6178	30.30	5.52
Saudi Arabia	Asia	1997	70.53300	21229759	20586.6902	22.10	4.59
Saudi Arabia	Asia	2002	71.62600	24501530	19014.5412	18.20	3.63
Saudi Arabia	Asia	2007	72.77700	27601038	21654.8319	16.00	3.05
Senegal	Africa	1952	37.27800	2755589	1450.3570	NA	NA
Senegal	Africa	1957	39.32900	3054547	1567.6530	NA	NA
Senegal	Africa	1962	41.45400	3430243	1654.9887	126.00	7.04
Senegal	Africa	1967	43.56300	3965841	1612.4046	124.70	7.23
Senegal	Africa	1972	45.81500	4588696	1597.7121	117.50	7.41
Senegal	Africa	1977	48.87900	5260855	1561.7691	100.70	7.46
Senegal	Africa	1982	52.37900	6147783	1518.4800	87.40	7.28
Senegal	Africa	1987	55.76900	7171347	1441.7207	75.50	6.93
Senegal	Africa	1992	58.19600	8307920	1367.8994	69.60	6.40
Senegal	Africa	1997	60.18700	9535314	1392.3683	71.20	5.84
Senegal	Africa	2002	61.60000	10870037	1519.6353	63.90	5.41
Senegal	Africa	2007	63.06200	12267493	1712.4721	51.90	5.14
Serbia	Europe	1952	57.99600	6860147	3581.4594	NA	NA
Serbia	Europe	1957	61.68500	7271135	4981.0909	NA	NA
Serbia	Europe	1962	64.53100	7616060	6289.6292	NA	2.57
Serbia	Europe	1967	66.91400	7971222	7991.7071	NA	2.44
Serbia	Europe	1972	68.70000	8313288	10522.0675	NA	2.37
Serbia	Europe	1977	70.30000	8686367	12980.6696	NA	2.37
Serbia	Europe	1982	70.16200	9032824	15181.0927	NA	2.33
Serbia	Europe	1987	71.21800	9230783	15870.8785	31.10	2.24
Serbia	Europe	1992	71.65900	9826397	9325.0682	20.90	2.00
Serbia	Europe	1997	72.23200	10336594	7914.3203	13.30	1.76
Serbia	Europe	2002	73.21300	10111559	7236.0753	10.10	1.57
Serbia	Europe	2007	74.00200	10150265	9786.5347	7.10	1.42
Sierra Leone	Africa	1952	30.33100	2143249	879.7877	NA	NA
Sierra Leone	Africa	1957	31.57000	2295678	1004.4844	NA	NA
Sierra Leone	Africa	1962	32.76700	2467895	1116.6399	217.50	6.16
Sierra Leone	Africa	1967	34.11300	2662190	1206.0435	200.80	6.52
Sierra Leone	Africa	1972	35.40000	2879013	1353.7598	185.20	6.80
Sierra Leone	Africa	1977	36.78800	3140897	1348.2852	173.20	7.01
Sierra Leone	Africa	1982	38.44500	3464522	1465.0108	164.10	7.03
Sierra Leone	Africa	1987	40.00600	3868905	1294.4478	158.30	6.75
Sierra Leone	Africa	1992	38.33300	4260884	1068.6963	155.70	6.39
Sierra Leone	Africa	1997	39.89700	4578212	574.6482	150.10	6.10
Sierra Leone	Africa	2002	41.01200	5359092	699.4897	137.70	5.76
Sierra Leone	Africa	2007	42.56800	6144562	862.5408	120.50	5.23
Singapore	Asia	1952	60.39600	1127000	2315.1382	NA	NA
Singapore	Asia	1957	63.17900	1445929	2843.1044	NA	NA
Singapore	Asia	1962	65.79800	1750200	3674.7356	30.80	5.27
Singapore	Asia	1967	67.94600	1977600	4977.4185	25.30	3.82
Singapore	Asia	1972	69.52100	2152400	8597.7562	19.60	2.84
Singapore	Asia	1977	70.79500	2325300	11210.0895	12.30	1.95
Singapore	Asia	1982	71.76000	2651869	15169.1611	10.70	1.74
Singapore	Asia	1987	73.56000	2794552	18861.5308	7.90	1.62
Singapore	Asia	1992	75.78800	3235865	24769.8912	5.00	1.72
Singapore	Asia	1997	77.15800	3802309	33519.4766	3.80	1.61
Singapore	Asia	2002	78.77000	4197776	36023.1054	2.60	1.37
Singapore	Asia	2007	79.97200	4553009	47143.1796	2.30	1.29
Slovak Republic	Europe	1952	64.36000	3558137	5074.6591	NA	NA
Slovak Republic	Europe	1957	67.45000	3844277	6093.2630	NA	NA
Slovak Republic	Europe	1962	70.33000	4237384	7481.1076	NA	2.94
Slovak Republic	Europe	1967	70.98000	4442238	8412.9024	NA	2.58
Slovak Republic	Europe	1972	70.35000	4593433	9674.1676	NA	2.50
Slovak Republic	Europe	1977	70.45000	4827803	10922.6640	NA	2.47
Slovak Republic	Europe	1982	70.80000	5048043	11348.5459	22.20	2.30
Slovak Republic	Europe	1987	71.08000	5199318	12037.2676	17.70	2.17
Slovak Republic	Europe	1992	71.38000	5302888	9498.4677	14.30	1.90
Slovak Republic	Europe	1997	72.71000	5383010	12126.2306	11.60	1.46
Slovak Republic	Europe	2002	73.80000	5410052	13638.7784	9.50	1.23
Slovak Republic	Europe	2007	74.66300	5447502	18678.3144	7.80	1.29
Slovenia	Europe	1952	65.57000	1489518	4215.0417	NA	NA
Slovenia	Europe	1957	67.85000	1533070	5862.2766	NA	NA
Slovenia	Europe	1962	69.15000	1582962	7402.3034	NA	2.33
Slovenia	Europe	1967	69.18000	1646912	9405.4894	NA	2.33
Slovenia	Europe	1972	69.82000	1694510	12383.4862	NA	2.24
Slovenia	Europe	1977	70.97000	1746919	15277.0302	NA	2.17
Slovenia	Europe	1982	71.06300	1861252	17866.7218	14.60	1.92
Slovenia	Europe	1987	72.25000	1945870	18678.5349	10.80	1.63
Slovenia	Europe	1992	73.64000	1999210	14214.7168	7.70	1.38
Slovenia	Europe	1997	75.13000	2011612	17161.1073	5.40	1.25
Slovenia	Europe	2002	76.66000	2011497	20660.0194	4.10	1.23
Slovenia	Europe	2007	77.92600	2009245	25768.2576	3.20	1.40
Somalia	Africa	1952	32.97800	2526994	1135.7498	NA	NA
Somalia	Africa	1957	34.97700	2780415	1258.1474	NA	NA
Somalia	Africa	1962	36.98100	3080153	1369.4883	NA	NA
Somalia	Africa	1967	38.97700	3428839	1284.7332	NA	NA
Somalia	Africa	1972	40.97300	3840161	1254.5761	NA	NA
Somalia	Africa	1977	41.97400	4353666	1450.9925	NA	NA
Somalia	Africa	1982	42.95500	5828892	1176.8070	NA	NA
Somalia	Africa	1987	44.50100	6921858	1093.2450	NA	NA
Somalia	Africa	1992	39.65800	6099799	926.9603	NA	NA
Somalia	Africa	1997	43.79500	6633514	930.5964	NA	NA
Somalia	Africa	2002	45.93600	7753310	882.0818	NA	NA
Somalia	Africa	2007	48.15900	9118773	926.1411	NA	NA
South Africa	Africa	1952	45.00900	14264935	4725.2955	NA	NA
South Africa	Africa	1957	47.98500	16151549	5487.1042	NA	NA
South Africa	Africa	1962	49.95100	18356657	5768.7297	NA	6.10
South Africa	Africa	1967	51.92700	20997321	7114.4780	NA	5.77
South Africa	Africa	1972	53.69600	23935810	7765.9626	NA	5.48
South Africa	Africa	1977	55.52700	27129932	8028.6514	78.60	5.06
South Africa	Africa	1982	58.16100	31140029	8568.2662	62.20	4.60
South Africa	Africa	1987	60.83400	35933379	7825.8234	51.40	4.05
South Africa	Africa	1992	61.88800	39964159	7225.0693	46.40	3.41
South Africa	Africa	1997	60.23600	42835005	7479.1882	50.90	2.98
South Africa	Africa	2002	53.36500	44433622	7710.9464	54.70	2.80
South Africa	Africa	2007	49.33900	43997828	9269.6578	48.60	2.58
Spain	Europe	1952	64.94000	28549870	3834.0347	NA	NA
Spain	Europe	1957	66.66000	29841614	4564.8024	NA	NA
Spain	Europe	1962	69.69000	31158061	5693.8439	41.70	2.80
Spain	Europe	1967	71.44000	32850275	7993.5123	32.10	2.85
Spain	Europe	1972	73.06000	34513161	10638.7513	22.60	2.86
Spain	Europe	1977	74.39000	36439000	13236.9212	19.70	2.59
Spain	Europe	1982	76.30000	37983310	13926.1700	13.20	1.96
Spain	Europe	1987	76.90000	38880702	15764.9831	10.40	1.49
Spain	Europe	1992	77.57000	39549438	18603.0645	8.50	1.28
Spain	Europe	1997	78.77000	39855442	20445.2990	6.10	1.20
Spain	Europe	2002	79.78000	40152517	24835.4717	5.20	1.27
Spain	Europe	2007	80.94100	40448191	28821.0637	4.40	1.40
Sri Lanka	Asia	1952	57.59300	7982342	1083.5320	NA	NA
Sri Lanka	Asia	1957	61.45600	9128546	1072.5466	NA	NA
Sri Lanka	Asia	1962	62.19200	10421936	1074.4720	67.10	5.30
Sri Lanka	Asia	1967	64.26600	11737396	1135.5143	57.00	4.73
Sri Lanka	Asia	1972	65.04200	13016733	1213.3955	51.90	4.08
Sri Lanka	Asia	1977	65.94900	14116836	1348.7757	45.60	3.63
Sri Lanka	Asia	1982	68.75700	15410151	1648.0798	34.10	3.22
Sri Lanka	Asia	1987	69.01100	16495304	1876.7668	20.50	2.70
Sri Lanka	Asia	1992	70.37900	17587060	2153.7392	18.20	2.39
Sri Lanka	Asia	1997	70.45700	18698655	2664.4773	16.00	2.25
Sri Lanka	Asia	2002	70.81500	19576783	3015.3788	13.20	2.25
Sri Lanka	Asia	2007	72.39600	20378239	3970.0954	10.70	2.31
Sudan	Africa	1952	38.63500	8504667	1615.9911	NA	NA
Sudan	Africa	1957	39.62400	9753392	1770.3371	NA	NA
Sudan	Africa	1962	40.87000	11183227	1959.5938	104.10	6.74
Sudan	Africa	1967	42.85800	12716129	1687.9976	97.40	6.85
Sudan	Africa	1972	45.08300	14597019	1659.6528	93.40	6.91
Sudan	Africa	1977	47.80000	17104986	2202.9884	89.80	6.92
Sudan	Africa	1982	50.33800	20367053	1895.5441	86.70	6.67
Sudan	Africa	1987	51.74400	24725960	1507.8192	82.80	6.34
Sudan	Africa	1992	53.55600	28227588	1492.1970	77.90	6.03
Sudan	Africa	1997	55.37300	32160729	1632.2108	72.30	5.67
Sudan	Africa	2002	56.36900	37090298	1993.3983	64.60	5.29
Sudan	Africa	2007	58.55600	42292929	2602.3950	57.10	4.87
Swaziland	Africa	1952	41.40700	290243	1148.3766	NA	NA
Swaziland	Africa	1957	43.42400	326741	1244.7084	NA	NA
Swaziland	Africa	1962	44.99200	370006	1856.1821	138.10	6.75
Swaziland	Africa	1967	46.63300	420690	2613.1017	126.50	6.84
Swaziland	Africa	1972	49.55200	480105	3364.8366	113.40	6.87
Swaziland	Africa	1977	52.53700	551425	3781.4106	93.90	6.76
Swaziland	Africa	1982	55.56100	649901	3895.3840	76.50	6.57
Swaziland	Africa	1987	57.67800	779348	3984.8398	59.40	6.18
Swaziland	Africa	1992	58.47400	962344	3553.0224	58.60	5.39
Swaziland	Africa	1997	54.28900	1054486	3876.7685	76.00	4.56
Swaziland	Africa	2002	43.86900	1130269	4128.1169	85.90	4.05
Swaziland	Africa	2007	39.61300	1133066	4513.4806	74.70	3.76
Sweden	Europe	1952	71.86000	7124673	8527.8447	NA	NA
Sweden	Europe	1957	72.49000	7363802	9911.8782	NA	NA
Sweden	Europe	1962	73.37000	7561588	12329.4419	15.60	2.26
Sweden	Europe	1967	74.16000	7867931	15258.2970	12.60	2.27
Sweden	Europe	1972	74.72000	8122293	17832.0246	10.40	1.91
Sweden	Europe	1977	75.44000	8251648	18855.7252	8.00	1.65
Sweden	Europe	1982	76.42000	8325260	20667.3812	6.80	1.63
Sweden	Europe	1987	77.19000	8421403	23586.9293	6.20	1.84
Sweden	Europe	1992	78.16000	8718867	23880.0168	5.10	2.08
Sweden	Europe	1997	79.39000	8897619	25266.5950	3.60	1.53
Sweden	Europe	2002	80.04000	8954175	29341.6309	3.30	1.67
Sweden	Europe	2007	80.88400	9031088	33859.7484	2.70	1.89
Switzerland	Europe	1952	69.62000	4815000	14734.2327	NA	NA
Switzerland	Europe	1957	70.56000	5126000	17909.4897	NA	NA
Switzerland	Europe	1962	71.32000	5666000	20431.0927	20.70	2.58
Switzerland	Europe	1967	72.77000	6063000	22966.1443	16.90	2.40
Switzerland	Europe	1972	73.78000	6401400	27195.1130	13.60	1.92
Switzerland	Europe	1977	75.39000	6316424	26982.2905	9.80	1.57
Switzerland	Europe	1982	76.21000	6468126	28397.7151	7.80	1.52
Switzerland	Europe	1987	77.41000	6649942	30281.7046	7.10	1.55
Switzerland	Europe	1992	78.03000	6995447	31871.5303	6.10	1.54
Switzerland	Europe	1997	79.37000	7193761	32135.3230	4.90	1.49
Switzerland	Europe	2002	80.62000	7361757	34480.9577	4.60	1.42
Switzerland	Europe	2007	81.70100	7554661	37506.4191	4.10	1.46
Syria	Asia	1952	45.88300	3661549	1643.4854	NA	NA
Syria	Asia	1957	48.28400	4149908	2117.2349	NA	NA
Syria	Asia	1962	50.30500	4834621	2193.0371	110.60	7.52
Syria	Asia	1967	53.65500	5680812	1881.9236	87.40	7.57
Syria	Asia	1972	57.29600	6701172	2571.4230	68.20	7.56
Syria	Asia	1977	61.19500	7932503	3195.4846	53.90	7.36
Syria	Asia	1982	64.59000	9410494	3761.8377	42.70	6.84
Syria	Asia	1987	66.97400	11242847	3116.7743	34.30	5.96
Syria	Asia	1992	69.24900	13219062	3340.5428	28.00	4.93
Syria	Asia	1997	71.52700	15081016	4014.2390	22.60	4.28
Syria	Asia	2002	73.05300	17155814	4090.9253	18.20	3.72
Syria	Asia	2007	74.14300	19314747	4184.5481	14.80	3.24
Taiwan	Asia	1952	58.50000	8550362	1206.9479	NA	NA
Taiwan	Asia	1957	62.40000	10164215	1507.8613	NA	NA
Taiwan	Asia	1962	65.20000	11918938	1822.8790	NA	NA
Taiwan	Asia	1967	67.50000	13648692	2643.8587	NA	NA
Taiwan	Asia	1972	69.39000	15226039	4062.5239	NA	NA
Taiwan	Asia	1977	70.59000	16785196	5596.5198	NA	NA
Taiwan	Asia	1982	72.16000	18501390	7426.3548	NA	NA
Taiwan	Asia	1987	73.40000	19757799	11054.5618	NA	NA
Taiwan	Asia	1992	74.26000	20686918	15215.6579	NA	NA
Taiwan	Asia	1997	75.25000	21628605	20206.8210	NA	NA
Taiwan	Asia	2002	76.99000	22454239	23235.4233	NA	NA
Taiwan	Asia	2007	78.40000	23174294	28718.2768	NA	NA
Tanzania	Africa	1952	41.21500	8322925	716.6501	NA	NA
Tanzania	Africa	1957	42.97400	9452826	698.5356	NA	NA
Tanzania	Africa	1962	44.24600	10863958	722.0038	141.90	6.80
Tanzania	Africa	1967	45.75700	12607312	848.2187	133.50	6.79
Tanzania	Africa	1972	47.62000	14706593	915.9851	124.00	6.76
Tanzania	Africa	1977	49.91900	17129565	962.4923	114.00	6.73
Tanzania	Africa	1982	50.60800	19844382	874.2426	107.60	6.58
Tanzania	Africa	1987	51.53500	23040630	831.8221	104.20	6.38
Tanzania	Africa	1992	50.44000	26605473	825.6825	98.90	6.08
Tanzania	Africa	1997	48.46600	30686889	789.1862	91.40	5.78
Tanzania	Africa	2002	49.65100	34593779	899.0742	71.40	5.67
Tanzania	Africa	2007	52.51700	38139640	1107.4822	51.50	5.59
Thailand	Asia	1952	50.84800	21289402	757.7974	NA	NA
Thailand	Asia	1957	53.63000	25041917	793.5774	NA	NA
Thailand	Asia	1962	56.06100	29263397	1002.1992	95.80	6.16
Thailand	Asia	1967	58.28500	34024249	1295.4607	80.80	6.01
Thailand	Asia	1972	60.40500	39276153	1524.3589	65.80	5.18
Thailand	Asia	1977	62.49400	44148285	1961.2246	52.90	4.03
Thailand	Asia	1982	64.59700	48827160	2393.2198	43.40	3.02
Thailand	Asia	1987	66.08400	52910342	2982.6538	35.10	2.35
Thailand	Asia	1992	67.29800	56667095	4616.8965	27.30	2.00
Thailand	Asia	1997	67.52100	60216677	5852.6255	21.70	1.78
Thailand	Asia	2002	68.56400	62806748	5913.1875	17.50	1.62
Thailand	Asia	2007	70.61600	65068149	7458.3963	14.00	1.50
Togo	Africa	1952	38.59600	1219113	859.8087	NA	NA
Togo	Africa	1957	41.20800	1357445	925.9083	NA	NA
Togo	Africa	1962	43.92200	1528098	1067.5348	156.40	6.62
Togo	Africa	1967	46.76900	1735550	1477.5968	141.80	6.91
Togo	Africa	1972	49.75900	2056351	1649.6602	127.20	7.18
Togo	Africa	1977	52.88700	2308582	1532.7770	114.10	7.28
Togo	Africa	1982	55.47100	2644765	1344.5780	102.70	7.10
Togo	Africa	1987	56.94100	3154264	1202.2014	94.00	6.68
Togo	Africa	1992	58.06100	3747553	1034.2989	87.90	6.08
Togo	Africa	1997	58.39000	4320890	982.2869	81.20	5.52
Togo	Africa	2002	57.56100	4977378	886.2206	72.60	5.17
Togo	Africa	2007	58.42000	5701579	882.9699	64.10	4.92
Trinidad and Tobago	Americas	1952	59.10000	662850	3023.2719	NA	NA
Trinidad and Tobago	Americas	1957	61.80000	764900	4100.3934	NA	NA
Trinidad and Tobago	Americas	1962	64.90000	887498	4997.5240	53.10	5.05
Trinidad and Tobago	Americas	1967	65.40000	960155	5621.3685	46.70	3.99
Trinidad and Tobago	Americas	1972	65.90000	975199	6619.5514	42.20	3.43
Trinidad and Tobago	Americas	1977	68.30000	1039009	7899.5542	37.40	3.27
Trinidad and Tobago	Americas	1982	68.83200	1116479	9119.5286	32.30	3.26
Trinidad and Tobago	Americas	1987	69.58200	1191336	7388.5978	28.40	2.83
Trinidad and Tobago	Americas	1992	69.86200	1183669	7370.9909	26.20	2.23
Trinidad and Tobago	Americas	1997	69.46500	1138101	8792.5731	25.50	1.84
Trinidad and Tobago	Americas	2002	68.97600	1101832	11460.6002	25.10	1.74
Trinidad and Tobago	Americas	2007	69.81900	1056608	18008.5092	22.80	1.79
Tunisia	Africa	1952	44.60000	3647735	1468.4756	NA	NA
Tunisia	Africa	1957	47.10000	3950849	1395.2325	NA	NA
Tunisia	Africa	1962	49.57900	4286552	1660.3032	178.70	7.12
Tunisia	Africa	1967	52.05300	4786986	1932.3602	141.40	6.87
Tunisia	Africa	1972	55.60200	5303507	2753.2860	110.90	6.16
Tunisia	Africa	1977	59.83700	6005061	3120.8768	83.20	5.71
Tunisia	Africa	1982	64.04800	6734098	3560.2332	62.20	5.02
Tunisia	Africa	1987	66.89400	7724976	3810.4193	49.50	4.08
Tunisia	Africa	1992	70.00100	8523077	4332.7202	41.20	3.19
Tunisia	Africa	1997	71.97300	9231669	4876.7986	31.90	2.39
Tunisia	Africa	2002	73.04200	9770575	5722.8957	23.30	2.04
Tunisia	Africa	2007	73.92300	10276158	7092.9230	17.50	2.04
Turkey	Europe	1952	43.58500	22235677	1969.1010	NA	NA
Turkey	Europe	1957	48.07900	25670939	2218.7543	NA	NA
Turkey	Europe	1962	52.09800	29788695	2322.8699	157.10	6.18
Turkey	Europe	1967	54.33600	33411317	2826.3564	136.60	5.80
Turkey	Europe	1972	57.00500	37492953	3450.6964	119.30	5.38
Turkey	Europe	1977	59.50700	42404033	4269.1223	101.50	4.74
Turkey	Europe	1982	61.03600	47328791	4241.3563	82.60	4.11
Turkey	Europe	1987	63.10800	52881328	5089.0437	64.80	3.43
Turkey	Europe	1992	66.14600	58179144	5678.3483	50.50	2.91
Turkey	Europe	1997	68.83500	63047647	6601.4299	38.50	2.61
Turkey	Europe	2002	70.84500	67308928	6508.0857	28.30	2.36
Turkey	Europe	2007	71.77700	71158647	8458.2764	20.20	2.17
Uganda	Africa	1952	39.97800	5824797	734.7535	NA	NA
Uganda	Africa	1957	42.57100	6675501	774.3711	NA	NA
Uganda	Africa	1962	45.34400	7688797	767.2717	127.30	7.04
Uganda	Africa	1967	48.05100	8900294	908.9185	117.20	7.11
Uganda	Africa	1972	51.01600	10190285	950.7359	113.70	7.11
Uganda	Africa	1977	50.35000	11457758	843.7331	123.30	7.10
Uganda	Africa	1982	49.84900	12939400	682.2662	125.00	7.10
Uganda	Africa	1987	51.50900	15283050	617.7244	114.70	7.10
Uganda	Africa	1992	48.82500	18252190	644.1708	106.80	7.07
Uganda	Africa	1997	44.57800	21210254	816.5591	98.10	6.97
Uganda	Africa	2002	47.81300	24739869	927.7210	81.60	6.77
Uganda	Africa	2007	51.54200	29170398	1056.3801	59.20	6.43
United Kingdom	Europe	1952	69.18000	50430000	9979.5085	NA	NA
United Kingdom	Europe	1957	70.42000	51430000	11283.1779	NA	NA
United Kingdom	Europe	1962	70.76000	53292000	12477.1771	22.00	2.79
United Kingdom	Europe	1967	71.36000	54959000	14142.8509	19.10	2.61
United Kingdom	Europe	1972	72.01000	56079000	15895.1164	17.20	2.07
United Kingdom	Europe	1977	72.76000	56179000	17428.7485	14.10	1.74
United Kingdom	Europe	1982	74.04000	56339704	18232.4245	10.80	1.76
United Kingdom	Europe	1987	75.00700	56981620	21664.7877	9.20	1.83
United Kingdom	Europe	1992	76.42000	57866349	22705.0925	7.00	1.79
United Kingdom	Europe	1997	77.21800	58808266	26074.5314	5.80	1.73
United Kingdom	Europe	2002	78.47100	59912431	29478.9992	5.30	1.67
United Kingdom	Europe	2007	79.42500	60776238	33203.2613	4.90	1.84
United States	Americas	1952	68.44000	157553000	13990.4821	NA	NA
United States	Americas	1957	69.49000	171984000	14847.1271	NA	NA
United States	Americas	1962	70.21000	186538000	16173.1459	24.90	3.48
United States	Americas	1967	70.76000	198712000	19530.3656	22.00	2.56
United States	Americas	1972	71.34000	209896000	21806.0359	18.30	2.01
United States	Americas	1977	73.38000	220239000	24072.6321	14.50	1.78
United States	Americas	1982	74.65000	232187835	25009.5591	11.70	1.81
United States	Americas	1987	75.02000	242803533	29884.3504	10.20	1.87
United States	Americas	1992	76.09000	256894189	32003.9322	8.80	2.04
United States	Americas	1997	76.81000	272911760	35767.4330	7.50	1.97
United States	Americas	2002	77.31000	287675526	39097.0995	6.90	2.02
United States	Americas	2007	78.24200	301139947	42951.6531	6.60	2.12
Uruguay	Americas	1952	66.07100	2252965	5716.7667	NA	NA
Uruguay	Americas	1957	67.04400	2424959	6150.7730	NA	NA
Uruguay	Americas	1962	68.25300	2598466	5603.3577	54.90	2.89
Uruguay	Americas	1967	68.46800	2748579	5444.6196	51.20	2.83
Uruguay	Americas	1972	68.67300	2829526	5703.4089	47.80	2.97
Uruguay	Americas	1977	69.48100	2873520	6504.3397	46.50	2.91
Uruguay	Americas	1982	70.80500	2953997	6920.2231	29.40	2.61
Uruguay	Americas	1987	71.91800	3045153	7452.3990	23.20	2.52
Uruguay	Americas	1992	72.75200	3149262	8137.0048	19.10	2.49
Uruguay	Americas	1997	74.22300	3262838	9230.2407	16.80	2.33
Uruguay	Americas	2002	75.30700	3363085	7727.0020	13.70	2.21
Uruguay	Americas	2007	76.38400	3447496	10611.4630	11.50	2.12
Venezuela	Americas	1952	55.08800	5439568	7689.7998	NA	NA
Venezuela	Americas	1957	57.90700	6702668	9802.4665	NA	NA
Venezuela	Americas	1962	60.77000	8143375	8422.9742	56.60	6.63
Venezuela	Americas	1967	63.47900	9709552	9541.4742	51.30	6.01
Venezuela	Americas	1972	65.71200	11515649	10505.2597	45.50	5.05
Venezuela	Americas	1977	67.45600	13503563	13143.9510	39.20	4.48
Venezuela	Americas	1982	68.55700	15620766	11152.4101	32.70	4.01
Venezuela	Americas	1987	70.19000	17910182	9883.5846	27.60	3.67
Venezuela	Americas	1992	71.15000	20265563	10733.9263	23.30	3.29
Venezuela	Americas	1997	72.14600	22374398	10165.4952	20.80	2.97
Venezuela	Americas	2002	72.76600	24287670	8605.0478	17.40	2.74
Venezuela	Americas	2007	73.74700	26084662	11415.8057	15.00	2.56
Vietnam	Asia	1952	40.41200	26246839	605.0665	NA	NA
Vietnam	Asia	1957	42.88700	28998543	676.2854	NA	NA
Vietnam	Asia	1962	45.36300	33796140	772.0492	69.90	6.43
Vietnam	Asia	1967	47.83800	39463910	637.1233	59.00	6.49
Vietnam	Asia	1972	50.25400	44655014	699.5016	54.70	6.35
Vietnam	Asia	1977	55.76400	50533506	713.5371	49.80	5.61
Vietnam	Asia	1982	58.81600	56142181	707.2358	44.80	4.69
Vietnam	Asia	1987	62.82000	62826491	820.7994	40.00	3.93
Vietnam	Asia	1992	67.66200	69940728	989.0231	34.30	3.26
Vietnam	Asia	1997	70.67200	76048996	1385.8968	28.90	2.31
Vietnam	Asia	2002	73.01700	80908147	1764.4567	24.60	1.92
Vietnam	Asia	2007	74.24900	85262356	2441.5764	21.40	1.88
West Bank and Gaza	Asia	1952	43.16000	1030585	1515.5923	NA	NA
West Bank and Gaza	Asia	1957	45.67100	1070439	1827.0677	NA	NA
West Bank and Gaza	Asia	1962	48.12700	1133134	2198.9563	NA	7.91
West Bank and Gaza	Asia	1967	51.63100	1142636	2649.7150	NA	8.02
West Bank and Gaza	Asia	1972	56.53200	1089572	3133.4093	NA	7.75
West Bank and Gaza	Asia	1977	60.76500	1261091	3682.8315	69.80	7.52
West Bank and Gaza	Asia	1982	64.40600	1425876	4336.0321	53.30	7.08
West Bank and Gaza	Asia	1987	67.04600	1691210	5107.1974	41.10	6.54
West Bank and Gaza	Asia	1992	69.71800	2104779	6017.6548	32.70	6.54
West Bank and Gaza	Asia	1997	71.09600	2826046	7110.6676	27.30	5.93
West Bank and Gaza	Asia	2002	72.37000	3389578	4515.4876	23.60	5.10
West Bank and Gaza	Asia	2007	73.42200	4018332	3025.3498	21.30	4.48
Yemen, Rep.	Asia	1952	32.54800	4963829	781.7176	NA	NA
Yemen, Rep.	Asia	1957	33.97000	5498090	804.8305	NA	NA
Yemen, Rep.	Asia	1962	35.18000	6120081	825.6232	NA	NA
Yemen, Rep.	Asia	1967	36.98400	6740785	862.4421	NA	NA
Yemen, Rep.	Asia	1972	39.84800	7407075	1265.0470	NA	NA
Yemen, Rep.	Asia	1977	44.17500	8403990	1829.7652	NA	NA
Yemen, Rep.	Asia	1982	49.11300	9657618	1977.5570	NA	NA
Yemen, Rep.	Asia	1987	52.92200	11219340	1971.7415	NA	NA
Yemen, Rep.	Asia	1992	55.59900	13367997	1879.4967	NA	NA
Yemen, Rep.	Asia	1997	58.02000	15826497	2117.4845	NA	NA
Yemen, Rep.	Asia	2002	60.30800	18701257	2234.8208	NA	NA
Yemen, Rep.	Asia	2007	62.69800	22211743	2280.7699	NA	NA
Zambia	Africa	1952	42.03800	2672000	1147.3888	NA	NA
Zambia	Africa	1957	44.07700	3016000	1311.9568	NA	NA
Zambia	Africa	1962	46.02300	3421000	1452.7258	118.70	7.13
Zambia	Africa	1967	47.76800	3900000	1777.0773	112.90	7.38
Zambia	Africa	1972	50.10700	4506497	1773.4983	103.70	7.45
Zambia	Africa	1977	51.38600	5216550	1588.6883	95.10	7.38
Zambia	Africa	1982	51.82100	6100407	1408.6786	98.30	7.02
Zambia	Africa	1987	50.82100	7272406	1213.3151	110.60	6.67
Zambia	Africa	1992	46.10000	8381163	1210.8846	112.40	6.34
Zambia	Africa	1997	40.23800	9417789	1071.3538	104.60	6.15
Zambia	Africa	2002	39.19300	10595811	1071.6139	86.50	6.02
Zambia	Africa	2007	42.38400	11746035	1271.2116	61.30	5.91
Zimbabwe	Africa	1952	48.45100	3080907	406.8841	NA	NA
Zimbabwe	Africa	1957	50.46900	3646340	518.7643	NA	NA
Zimbabwe	Africa	1962	52.35800	4277736	527.2722	87.60	7.27
Zimbabwe	Africa	1967	53.99500	4995432	569.7951	76.30	7.40
Zimbabwe	Africa	1972	55.63500	5861135	799.3622	71.10	7.42
Zimbabwe	Africa	1977	57.67400	6642107	685.5877	69.80	7.33
Zimbabwe	Africa	1982	60.36300	7636524	788.8550	61.60	6.81
Zimbabwe	Africa	1987	62.35100	9216418	706.1573	50.40	5.78
Zimbabwe	Africa	1992	60.37700	10704340	693.4208	54.50	4.84
Zimbabwe	Africa	1997	46.80900	11404948	792.4500	62.70	4.24
Zimbabwe	Africa	2002	39.98900	11926563	672.0386	62.70	4.02
Zimbabwe	Africa	2007	43.48700	12311143	469.7093	59.90	3.90

Let’s find the unique years in the data.

gapminder_dataset["year"].unique()

##  [1] 1952 1957 1962 1967 1972 1977 1982 1987 1992 1997 2002 2007

Let’s now filter our gapminder dataset into the separate years.

# Filtering the data for a specific year

year_1952 = gapminder_dataset[gapminder_dataset['year'] == 1952]

year_1957 = gapminder_dataset[gapminder_dataset['year'] == 1957]

year_1962 = gapminder_dataset[gapminder_dataset['year'] == 1962]

year_1967 = gapminder_dataset[gapminder_dataset['year'] == 1967]

year_1977 = gapminder_dataset[gapminder_dataset['year'] == 1977]

year_1982 = gapminder_dataset[gapminder_dataset['year'] == 1982]

year_1987 = gapminder_dataset[gapminder_dataset['year'] == 1987]

year_1992 = gapminder_dataset[gapminder_dataset['year'] == 1992]

year_1997 = gapminder_dataset[gapminder_dataset['year'] == 1997]

year_2002 = gapminder_dataset[gapminder_dataset['year'] == 2002]

You can see above that I have repeated the same code multiple times and only change a few parts of it.This was okay for 12 years, but what if we had 100 unique years.

The general rule is that if you copy and paste code more than 3 times you should create a function.

So instead of copying and pasting the code I have created the function below to extract data for unique years.

I have also included a loop, which will iterate over the whole year column.

To use this function you need to specify the dataframe and the column names. This will save the datasets in a dictionary which we can access by specifying the year.

# We can extract any column now

def extract_values(dataframe, column):
    '''
    Document String
    
    Splits a DataFrame into multiple Dataframes based on the unique values in a column.
    Returns a Dictionary. 
    Each Key is a unique value from the column and the dictionary value 
    is the results of the filter of that value.
    
    Paramaters
    Dataframe = a Pandas Dataframe of the data you wish to split
    column = The column with unique values you wish to split. 
    
    '''
    values_dictionary = {}
    
    values_unique = dataframe[column].unique()
    
    for each_value in values_unique:
      
        values_dictionary[key] = dataframe[dataframe[column] == each_value]
        
    return values_dictionary

Let’s use the function, so below I am saving the output in a variable called values_dictionary, storing all the smaller datasets separately.

# Using the function

values_dictionary = extract_values(dataframe = gapminder_dataset, 
                                      column = "year")

To access the datasets, you only need to specify the year. As shown below, we can see we have the 1957 dataset.

# Using the function
# How you reference a dictionary note here the keys are integer

values_dictionary[1957]

country	continent	year	lifeExp	pop	gdpPercap	infant_mortality	fertility
Afghanistan	Asia	1957	30.33200	9240934	820.8530	NA	NA
Albania	Europe	1957	59.28000	1476505	1942.2842	NA	NA
Algeria	Africa	1957	45.68500	10270856	3013.9760	NA	NA
Angola	Africa	1957	31.99900	4561361	3827.9405	NA	NA
Argentina	Americas	1957	64.39900	19610538	6856.8562	NA	NA
Australia	Oceania	1957	70.33000	9712569	10949.6496	NA	NA
Austria	Europe	1957	67.48000	6965860	8842.5980	NA	NA
Bahrain	Asia	1957	53.83200	138655	11635.7995	NA	NA
Bangladesh	Asia	1957	39.34800	51365468	661.6375	NA	NA
Belgium	Europe	1957	69.24000	8989111	9714.9606	NA	NA
Benin	Africa	1957	40.35800	1925173	959.6011	NA	NA
Bolivia	Americas	1957	41.89000	3211738	2127.6863	NA	NA
Bosnia and Herzegovina	Europe	1957	58.45000	3076000	1353.9892	NA	NA
Botswana	Africa	1957	49.61800	474639	918.2325	NA	NA
Brazil	Americas	1957	53.28500	65551171	2487.3660	NA	NA
Bulgaria	Europe	1957	66.61000	7651254	3008.6707	NA	NA
Burkina Faso	Africa	1957	34.90600	4713416	617.1835	NA	NA
Burundi	Africa	1957	40.53300	2667518	379.5646	NA	NA
Cambodia	Asia	1957	41.36600	5322536	434.0383	NA	NA
Cameroon	Africa	1957	40.42800	5359923	1313.0481	NA	NA
Canada	Americas	1957	69.96000	17010154	12489.9501	NA	NA
Central African Republic	Africa	1957	37.46400	1392284	1190.8443	NA	NA
Chad	Africa	1957	39.88100	2894855	1308.4956	NA	NA
Chile	Americas	1957	56.07400	7048426	4315.6227	NA	NA
China	Asia	1957	50.54896	637408000	575.9870	NA	NA
Colombia	Americas	1957	55.11800	14485993	2323.8056	NA	NA
Comoros	Africa	1957	42.46000	170928	1211.1485	NA	NA
Congo, Dem. Rep.	Africa	1957	40.65200	15577932	905.8602	NA	NA
Congo, Rep.	Africa	1957	45.05300	940458	2315.0566	NA	NA
Costa Rica	Americas	1957	60.02600	1112300	2990.0108	NA	NA
Cote d’Ivoire	Africa	1957	42.46900	3300000	1500.8959	NA	NA
Croatia	Europe	1957	64.77000	3991242	4338.2316	NA	NA
Cuba	Americas	1957	62.32500	6640752	6092.1744	NA	NA
Czech Republic	Europe	1957	69.03000	9513758	8256.3439	NA	NA
Denmark	Europe	1957	71.81000	4487831	11099.6593	NA	NA
Djibouti	Africa	1957	37.32800	71851	2864.9691	NA	NA
Dominican Republic	Americas	1957	49.82800	2923186	1544.4030	NA	NA
Ecuador	Americas	1957	51.35600	4058385	3780.5467	NA	NA
Egypt	Africa	1957	44.44400	25009741	1458.9153	NA	NA
El Salvador	Americas	1957	48.57000	2355805	3421.5232	NA	NA
Equatorial Guinea	Africa	1957	35.98300	232922	426.0964	NA	NA
Eritrea	Africa	1957	38.04700	1542611	344.1619	NA	NA
Ethiopia	Africa	1957	36.66700	22815614	378.9042	NA	NA
Finland	Europe	1957	67.49000	4324000	7545.4154	NA	NA
France	Europe	1957	68.93000	44310863	8662.8349	NA	NA
Gabon	Africa	1957	38.99900	434904	4976.1981	NA	NA
Gambia	Africa	1957	32.06500	323150	520.9267	NA	NA
Germany	Europe	1957	69.10000	71019069	10187.8267	NA	NA
Ghana	Africa	1957	44.77900	6391288	1043.5615	NA	NA
Greece	Europe	1957	67.86000	8096218	4916.2999	NA	NA
Guatemala	Americas	1957	44.14200	3640876	2617.1560	NA	NA
Guinea	Africa	1957	34.55800	2876726	576.2670	NA	NA
Guinea-Bissau	Africa	1957	33.48900	601095	431.7905	NA	NA
Haiti	Americas	1957	40.69600	3507701	1726.8879	NA	NA
Honduras	Americas	1957	44.66500	1770390	2220.4877	NA	NA
Hong Kong, China	Asia	1957	64.75000	2736300	3629.0765	NA	NA
Hungary	Europe	1957	66.41000	9839000	6040.1800	NA	NA
Iceland	Europe	1957	73.47000	165110	9244.0014	NA	NA
India	Asia	1957	40.24900	409000000	590.0620	NA	NA
Indonesia	Asia	1957	39.91800	90124000	858.9003	NA	NA
Iran	Asia	1957	47.18100	19792000	3290.2576	NA	NA
Iraq	Asia	1957	48.43700	6248643	6229.3336	NA	NA
Ireland	Europe	1957	68.90000	2878220	5599.0779	NA	NA
Israel	Asia	1957	67.84000	1944401	5385.2785	NA	NA
Italy	Europe	1957	67.81000	49182000	6248.6562	NA	NA
Jamaica	Americas	1957	62.61000	1535090	4756.5258	NA	NA
Japan	Asia	1957	65.50000	91563009	4317.6944	NA	NA
Jordan	Asia	1957	45.66900	746559	1886.0806	NA	NA
Kenya	Africa	1957	44.68600	7454779	944.4383	NA	NA
Korea, Dem. Rep.	Asia	1957	54.08100	9411381	1571.1347	NA	NA
Korea, Rep.	Asia	1957	52.68100	22611552	1487.5935	NA	NA
Kuwait	Asia	1957	58.03300	212846	113523.1329	NA	NA
Lebanon	Asia	1957	59.48900	1647412	6089.7869	NA	NA
Lesotho	Africa	1957	45.04700	813338	335.9971	NA	NA
Liberia	Africa	1957	39.48600	975950	620.9700	NA	NA
Libya	Africa	1957	45.28900	1201578	3448.2844	NA	NA
Madagascar	Africa	1957	38.86500	5181679	1589.2027	NA	NA
Malawi	Africa	1957	37.20700	3221238	416.3698	NA	NA
Malaysia	Asia	1957	52.10200	7739235	1810.0670	NA	NA
Mali	Africa	1957	35.30700	4241884	490.3822	NA	NA
Mauritania	Africa	1957	42.33800	1076852	846.1203	NA	NA
Mauritius	Africa	1957	58.08900	609816	2034.0380	NA	NA
Mexico	Americas	1957	55.19000	35015548	4131.5466	NA	NA
Mongolia	Asia	1957	45.24800	882134	912.6626	NA	NA
Montenegro	Europe	1957	61.44800	442829	3682.2599	NA	NA
Morocco	Africa	1957	45.42300	11406350	1642.0023	NA	NA
Mozambique	Africa	1957	33.77900	7038035	495.5868	NA	NA
Myanmar	Asia	1957	41.90500	21731844	350.0000	NA	NA
Namibia	Africa	1957	45.22600	548080	2621.4481	NA	NA
Nepal	Asia	1957	37.68600	9682338	597.9364	NA	NA
Netherlands	Europe	1957	72.99000	11026383	11276.1934	NA	NA
New Zealand	Oceania	1957	70.26000	2229407	12247.3953	NA	NA
Nicaragua	Americas	1957	45.43200	1358828	3457.4159	NA	NA
Niger	Africa	1957	38.59800	3692184	835.5234	NA	NA
Nigeria	Africa	1957	37.80200	37173340	1100.5926	NA	NA
Norway	Europe	1957	73.44000	3491938	11653.9730	NA	NA
Oman	Asia	1957	40.08000	561977	2242.7466	NA	NA
Pakistan	Asia	1957	45.55700	46679944	747.0835	NA	NA
Panama	Americas	1957	59.20100	1063506	2961.8009	NA	NA
Paraguay	Americas	1957	63.19600	1770902	2046.1547	NA	NA
Peru	Americas	1957	46.26300	9146100	4245.2567	NA	NA
Philippines	Asia	1957	51.33400	26072194	1547.9448	NA	NA
Poland	Europe	1957	65.77000	28235346	4734.2530	NA	NA
Portugal	Europe	1957	61.51000	8817650	3774.5717	NA	NA
Puerto Rico	Americas	1957	68.54000	2260000	3907.1562	NA	NA
Reunion	Africa	1957	55.09000	308700	2769.4518	NA	NA
Romania	Europe	1957	64.10000	17829327	3943.3702	NA	NA
Rwanda	Africa	1957	41.50000	2822082	540.2894	NA	NA
Sao Tome and Principe	Africa	1957	48.94500	61325	860.7369	NA	NA
Saudi Arabia	Asia	1957	42.86800	4419650	8157.5912	NA	NA
Senegal	Africa	1957	39.32900	3054547	1567.6530	NA	NA
Serbia	Europe	1957	61.68500	7271135	4981.0909	NA	NA
Sierra Leone	Africa	1957	31.57000	2295678	1004.4844	NA	NA
Singapore	Asia	1957	63.17900	1445929	2843.1044	NA	NA
Slovak Republic	Europe	1957	67.45000	3844277	6093.2630	NA	NA
Slovenia	Europe	1957	67.85000	1533070	5862.2766	NA	NA
Somalia	Africa	1957	34.97700	2780415	1258.1474	NA	NA
South Africa	Africa	1957	47.98500	16151549	5487.1042	NA	NA
Spain	Europe	1957	66.66000	29841614	4564.8024	NA	NA
Sri Lanka	Asia	1957	61.45600	9128546	1072.5466	NA	NA
Sudan	Africa	1957	39.62400	9753392	1770.3371	NA	NA
Swaziland	Africa	1957	43.42400	326741	1244.7084	NA	NA
Sweden	Europe	1957	72.49000	7363802	9911.8782	NA	NA
Switzerland	Europe	1957	70.56000	5126000	17909.4897	NA	NA
Syria	Asia	1957	48.28400	4149908	2117.2349	NA	NA
Taiwan	Asia	1957	62.40000	10164215	1507.8613	NA	NA
Tanzania	Africa	1957	42.97400	9452826	698.5356	NA	NA
Thailand	Asia	1957	53.63000	25041917	793.5774	NA	NA
Togo	Africa	1957	41.20800	1357445	925.9083	NA	NA
Trinidad and Tobago	Americas	1957	61.80000	764900	4100.3934	NA	NA
Tunisia	Africa	1957	47.10000	3950849	1395.2325	NA	NA
Turkey	Europe	1957	48.07900	25670939	2218.7543	NA	NA
Uganda	Africa	1957	42.57100	6675501	774.3711	NA	NA
United Kingdom	Europe	1957	70.42000	51430000	11283.1779	NA	NA
United States	Americas	1957	69.49000	171984000	14847.1271	NA	NA
Uruguay	Americas	1957	67.04400	2424959	6150.7730	NA	NA
Venezuela	Americas	1957	57.90700	6702668	9802.4665	NA	NA
Vietnam	Asia	1957	42.88700	28998543	676.2854	NA	NA
West Bank and Gaza	Asia	1957	45.67100	1070439	1827.0677	NA	NA
Yemen, Rep.	Asia	1957	33.97000	5498090	804.8305	NA	NA
Zambia	Africa	1957	44.07700	3016000	1311.9568	NA	NA
Zimbabwe	Africa	1957	50.46900	3646340	518.7643	NA	NA

We can try a different year.

# Using the function
# How you reference a dictionary note here the keys are integer

values_dictionary[1987]

country	continent	year	lifeExp	pop	gdpPercap	infant_mortality	fertility
Afghanistan	Asia	1987	40.822	13867957	852.3959	NA	NA
Albania	Europe	1987	72.000	3075321	3738.9327	40.8	3.13
Algeria	Africa	1987	65.799	23254956	5681.3585	46.3	5.51
Angola	Africa	1987	39.906	7874230	2430.2083	134.1	7.20
Argentina	Americas	1987	70.774	31620918	9139.6714	27.1	3.06
Australia	Oceania	1987	76.320	16257249	21888.8890	8.7	1.85
Austria	Europe	1987	74.940	7578903	23687.8261	9.4	1.43
Bahrain	Asia	1987	70.750	454612	18524.0241	20.1	4.13
Bangladesh	Asia	1987	52.819	103764241	751.9794	110.8	5.13
Belgium	Europe	1987	75.350	9870200	22525.5631	9.2	1.56
Benin	Africa	1987	52.337	4243788	1225.8560	114.8	6.90
Bolivia	Americas	1987	57.251	6156369	2753.6915	94.0	5.03
Bosnia and Herzegovina	Europe	1987	71.140	4338977	4314.1148	20.4	1.89
Botswana	Africa	1987	63.622	1151184	6205.8839	42.0	5.21
Brazil	Americas	1987	65.205	142938076	7807.0958	56.8	3.17
Bulgaria	Europe	1987	71.340	8971958	8239.8548	18.2	1.94
Burkina Faso	Africa	1987	49.557	7586551	912.0631	105.3	7.09
Burundi	Africa	1987	48.211	5126023	621.8188	103.3	7.57
Cambodia	Asia	1987	53.914	8371791	683.8956	86.0	6.07
Cameroon	Africa	1987	54.985	10780667	2602.6642	87.2	6.63
Canada	Americas	1987	76.860	26549700	26626.5150	7.5	1.58
Central African Republic	Africa	1987	50.485	2840009	844.8764	115.5	5.90
Chad	Africa	1987	51.051	5498955	952.3861	119.3	7.20
Chile	Americas	1987	72.492	12463354	5547.0638	18.4	2.65
China	Asia	1987	67.274	1084035000	1378.9040	42.0	2.68
Colombia	Americas	1987	67.768	30964245	4903.2191	31.5	3.28
Comoros	Africa	1987	54.926	395114	1315.9808	95.8	6.14
Congo, Dem. Rep.	Africa	1987	47.412	35481645	672.7748	122.9	6.96
Congo, Rep.	Africa	1987	57.470	2064095	4201.1949	60.9	5.59
Costa Rica	Americas	1987	74.752	2799811	5629.9153	16.3	3.38
Cote d’Ivoire	Africa	1987	54.655	10761098	2156.9561	105.2	6.75
Croatia	Europe	1987	71.520	4484310	13822.5839	13.8	1.84
Cuba	Americas	1987	74.174	10239839	7532.9248	13.3	1.83
Czech Republic	Europe	1987	71.580	10311597	16310.4434	14.3	1.93
Denmark	Europe	1987	74.800	5127024	25116.1758	8.0	1.50
Djibouti	Africa	1987	50.040	311025	2880.1026	98.9	6.19
Dominican Republic	Americas	1987	66.046	6655297	2899.8422	51.3	3.70
Ecuador	Americas	1987	67.231	9545158	6481.7770	50.1	4.04
Egypt	Africa	1987	59.797	52799062	3885.4607	73.5	4.83
El Salvador	Americas	1987	63.154	4842194	4140.4421	53.3	4.26
Equatorial Guinea	Africa	1987	45.664	341244	966.8968	135.3	5.88
Eritrea	Africa	1987	46.453	2915959	521.1341	101.6	6.54
Ethiopia	Africa	1987	46.684	42999530	573.7413	127.6	7.39
Finland	Europe	1987	74.830	4931729	21141.0122	5.9	1.59
France	Europe	1987	76.340	55630100	22066.4421	8.1	1.81
Gabon	Africa	1987	60.190	880397	11864.4084	62.5	5.61
Gambia	Africa	1987	49.265	848406	611.6589	86.5	6.16
Germany	Europe	1987	74.847	77718298	24639.1857	8.3	1.43
Ghana	Africa	1987	55.729	14168101	847.0061	89.0	5.94
Greece	Europe	1987	76.670	9974490	16120.5284	13.9	1.58
Guatemala	Americas	1987	60.782	7326406	4246.4860	67.7	5.76
Guinea	Africa	1987	45.552	5650262	805.5725	150.0	6.64
Guinea-Bissau	Africa	1987	41.245	927524	736.4154	143.1	6.73
Haiti	Americas	1987	53.636	5756203	1823.0160	108.8	5.80
Honduras	Americas	1987	64.492	4372203	3023.0967	51.2	5.44
Hong Kong, China	Asia	1987	76.200	5584510	20038.4727	NA	1.39
Hungary	Europe	1987	69.580	10612740	12986.4800	19.4	1.84
Iceland	Europe	1987	77.230	244676	26923.2063	5.6	2.13
India	Asia	1987	58.553	788000000	976.5127	95.6	4.13
Indonesia	Asia	1987	60.137	169276000	1748.3570	69.3	3.47
Iran	Asia	1987	63.040	51889696	6642.8814	51.9	5.76
Iraq	Asia	1987	65.044	16543189	11643.5727	45.1	6.11
Ireland	Europe	1987	74.360	3539900	13872.8665	8.4	2.23
Israel	Asia	1987	75.600	4203148	17122.4799	11.0	3.06
Italy	Europe	1987	76.420	56729703	19207.2348	9.4	1.35
Jamaica	Americas	1987	71.770	2326606	6351.2375	27.5	3.14
Japan	Asia	1987	78.670	122091325	22375.9419	5.0	1.67
Jordan	Asia	1987	65.869	2820042	4448.6799	33.1	6.16
Kenya	Africa	1987	59.339	21198082	1361.9369	62.7	6.60
Korea, Dem. Rep.	Asia	1987	70.647	19067554	4106.4923	NA	NA
Korea, Rep.	Asia	1987	69.810	41622000	8533.0888	NA	NA
Kuwait	Asia	1987	74.174	1891487	28118.4300	17.6	3.31
Lebanon	Asia	1987	67.926	3089353	5377.0913	30.8	3.28
Lesotho	Africa	1987	57.180	1599200	773.9932	73.7	5.17
Liberia	Africa	1987	46.027	2269414	506.1139	161.5	6.75
Libya	Africa	1987	66.234	3799845	11770.5898	41.3	5.91
Madagascar	Africa	1987	49.350	10568642	1155.4419	106.4	6.23
Malawi	Africa	1987	47.457	7824747	635.5174	149.6	7.40
Malaysia	Asia	1987	69.500	16331785	5249.8027	16.6	3.60
Mali	Africa	1987	46.364	7634008	684.1716	137.8	7.09
Mauritania	Africa	1987	56.145	1841240	1421.6036	82.1	6.10
Mauritius	Africa	1987	68.740	1042663	4783.5869	24.4	2.27
Mexico	Americas	1987	69.498	80122492	8688.1560	42.1	3.67
Mongolia	Asia	1987	60.222	2015133	2338.0083	87.3	4.91
Montenegro	Europe	1987	74.865	569473	11732.5102	18.2	1.98
Morocco	Africa	1987	62.677	22987397	2755.0470	71.0	4.57
Mozambique	Africa	1987	42.861	12891952	389.8762	165.7	6.35
Myanmar	Asia	1987	58.339	38028578	385.0000	NA	NA
Namibia	Africa	1987	60.835	1278184	3693.7313	53.8	5.63
Nepal	Asia	1987	52.537	17917180	775.6325	111.1	5.38
Netherlands	Europe	1987	76.830	14665278	23651.3236	7.5	1.56
New Zealand	Oceania	1987	74.320	3317166	19007.1913	10.6	2.24
Nicaragua	Americas	1987	62.008	3344353	2955.9844	56.5	5.12
Niger	Africa	1987	44.555	7332638	668.3000	141.4	7.77
Nigeria	Africa	1987	46.886	81551520	1385.0296	125.4	6.63
Norway	Europe	1987	75.890	4186147	31540.9748	8.2	1.75
Oman	Asia	1987	67.734	1593882	18115.2231	41.8	7.93
Pakistan	Asia	1987	58.245	105186881	1704.6866	111.4	6.31
Panama	Americas	1987	71.523	2253639	7034.7792	28.1	3.26
Paraguay	Americas	1987	67.378	3886512	3998.8757	40.7	4.84
Peru	Americas	1987	64.134	20195924	6360.9434	64.6	4.14
Philippines	Asia	1987	64.151	60017788	2189.6350	46.7	4.55
Poland	Europe	1987	70.980	37740710	9082.3512	16.6	2.19
Portugal	Europe	1987	74.060	9915289	13039.3088	14.5	1.65
Puerto Rico	Americas	1987	74.630	3444468	12281.3419	NA	2.28
Reunion	Africa	1987	71.913	562035	5303.3775	NA	NA
Romania	Europe	1987	69.530	22686371	9696.2733	32.6	2.41
Rwanda	Africa	1987	44.020	6349365	847.9912	93.1	8.00
Sao Tome and Principe	Africa	1987	61.728	110812	1516.5255	NA	NA
Saudi Arabia	Asia	1987	66.295	14619745	21198.2614	45.2	6.33
Senegal	Africa	1987	55.769	7171347	1441.7207	75.5	6.93
Serbia	Europe	1987	71.218	9230783	15870.8785	31.1	2.24
Sierra Leone	Africa	1987	40.006	3868905	1294.4478	158.3	6.75
Singapore	Asia	1987	73.560	2794552	18861.5308	7.9	1.62
Slovak Republic	Europe	1987	71.080	5199318	12037.2676	17.7	2.17
Slovenia	Europe	1987	72.250	1945870	18678.5349	10.8	1.63
Somalia	Africa	1987	44.501	6921858	1093.2450	NA	NA
South Africa	Africa	1987	60.834	35933379	7825.8234	51.4	4.05
Spain	Europe	1987	76.900	38880702	15764.9831	10.4	1.49
Sri Lanka	Asia	1987	69.011	16495304	1876.7668	20.5	2.70
Sudan	Africa	1987	51.744	24725960	1507.8192	82.8	6.34
Swaziland	Africa	1987	57.678	779348	3984.8398	59.4	6.18
Sweden	Europe	1987	77.190	8421403	23586.9293	6.2	1.84
Switzerland	Europe	1987	77.410	6649942	30281.7046	7.1	1.55
Syria	Asia	1987	66.974	11242847	3116.7743	34.3	5.96
Taiwan	Asia	1987	73.400	19757799	11054.5618	NA	NA
Tanzania	Africa	1987	51.535	23040630	831.8221	104.2	6.38
Thailand	Asia	1987	66.084	52910342	2982.6538	35.1	2.35
Togo	Africa	1987	56.941	3154264	1202.2014	94.0	6.68
Trinidad and Tobago	Americas	1987	69.582	1191336	7388.5978	28.4	2.83
Tunisia	Africa	1987	66.894	7724976	3810.4193	49.5	4.08
Turkey	Europe	1987	63.108	52881328	5089.0437	64.8	3.43
Uganda	Africa	1987	51.509	15283050	617.7244	114.7	7.10
United Kingdom	Europe	1987	75.007	56981620	21664.7877	9.2	1.83
United States	Americas	1987	75.020	242803533	29884.3504	10.2	1.87
Uruguay	Americas	1987	71.918	3045153	7452.3990	23.2	2.52
Venezuela	Americas	1987	70.190	17910182	9883.5846	27.6	3.67
Vietnam	Asia	1987	62.820	62826491	820.7994	40.0	3.93
West Bank and Gaza	Asia	1987	67.046	1691210	5107.1974	41.1	6.54
Yemen, Rep.	Asia	1987	52.922	11219340	1971.7415	NA	NA
Zambia	Africa	1987	50.821	7272406	1213.3151	110.6	6.67
Zimbabwe	Africa	1987	62.351	9216418	706.1573	50.4	5.78

We can use this for any dataset and any column.

Here am using the country column and selecting the data for Malawi.

# Using the function

values_dictionary = extract_values(dataframe = gapminder_dataset, column = "continent")

# Using the function
# How you reference a dictionary note here the keys are integer

values_dictionary["Asia"]

country	continent	year	lifeExp	pop	gdpPercap	infant_mortality	fertility
Malawi	Africa	1952	36.256	2917802	369.1651	NA	NA
Malawi	Africa	1957	37.207	3221238	416.3698	NA	NA
Malawi	Africa	1962	38.410	3628608	427.9011	214.6	6.98
Malawi	Africa	1967	39.487	4147252	495.5148	211.5	7.18
Malawi	Africa	1972	41.766	4730997	584.6220	200.6	7.39
Malawi	Africa	1977	43.767	5637246	663.2237	170.6	7.58
Malawi	Africa	1982	45.642	6502825	632.8039	144.4	7.61
Malawi	Africa	1987	47.457	7824747	635.5174	149.6	7.40
Malawi	Africa	1992	49.420	10014249	563.2000	133.1	6.72
Malawi	Africa	1997	47.495	10419991	692.2758	117.1	6.41
Malawi	Africa	2002	45.009	11824495	665.4231	88.8	6.12
Malawi	Africa	2007	48.303	13327079	759.3499	64.5	5.84

---

3.4 Make it Modular

Do not have a single file that does everything. If you split your code into separate, independent modules it will be easier to read, debug, test, and use.

For example, you could break your project into the scripts shown below.

project
|-- main.py
|-- data_cleaning.py
|-- modelling.py
|-- reporting.py

Within your scripts, do not have a single function that tries to do everything.

Functions should have limits too; they should do one thing only.

# This is bad
def transform(text, uppercase):
    if uppercase:
        return text.upper()
    else:
        return text.lower()

# This is good
def uppercase(text):
    return text.upper()

def lowercase(text):
    return text.lower()

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4 Project Structure

As your analysis project grows, it becomes more important to keep your project structure clean. Every project is different, and the right way to organise your project might differ from another project. However, there are some principles that are useful to consider.

A typical analytical project folder might look like:

|-- requirements.txt
|-- data/
|   -- incident_counts.csv
|-- docs/
|   -- notebook.md
|-- results/
|   -- incident_counts_by_age.csv
|   -- incidents_over_time.svg
|-- analysis/
|   -- data_cleaning.py
|   -- main_analysis.py
|   -- generate_plots.py

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4.1 Raw data should be preserved

You should not alter raw data - treat it as read-only. Even data cleaning should take place on a copy of the raw data, so that you can document which cleaning decisions have been made.

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4.2 Outputs should be disposable

You should be able to dispose of your outputs, deleting them, without worrying. If you are worried about deleting your outputs (i.e. results) then it is unlikely you have confidence in being able to reproduce your results.

It is good practice to delete and regenerate your outputs frequently when developing analysis.

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5 Code Review

Perform code reviews: give what you’ve done to a colleague and ask them to go through it line-by-line to check it works as intended. I’ll be very suprised if they do this properly and don’t find any mistakes or issues. Return the favour to magically become a better coder yourself.

Here is an example of project in which code was formally peer reviewed.

stats19

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6 Version Control

Version control is managing changes to your analysis over time.

An audit trail is essential for assuring quality analysis. It’s important for us to be able to answer the following questions about our analysis:

• What changes have been made to our project?

• When were those changes made?

• Why were those changes made?

• Who made those changes?

Version control software, like Git, records the answers to these questions throughout the development of a project.

Repositories or “repos” are typically project folders that are version controlled using Git or a similar version control system. One repository usually contains a single project. Developing your project using a version controlled repository has significant benefits for reproducibility.

In a public repository, you may need to omit confidential or sensitive aspects of the project, below is an example of a project.

Analysing UK port and shipping operations using big data

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7 Summary

When writing clean code, remember to;

• Use Descriptive Names, be consistent with your naming convention

• Write meaningful comments

• Don’t Repeat Yourself - use functions, loops and conditional statements

• Be consistent with your naming convention

• Keeping projects clean and organised

• Arrange code reviews

• Use version control

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8 Acknowledgement and References

Images and Illustrations done by Allison Horst

Quality Assurance of Code for Analysis and Research

Coding for Economists

Coding from zero

Best Practice in Programming for Data Scientists: Clean Code

Guttmacher Institute Coding Style Guide

DRY Code and Modularity

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